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4. 8× 5/4 + 1/4 = 41/4
5. 6÷ 3/8 – 3/8 ÷6 = 255/16
6. 4/7 × 5/9 + 3/7 × 5/9 = 5/9
7. 5/2 -（ 3/2 + 4/5 ） = 1/5
8. 7/8 + （ 1/8 + 1/9 ） = 10/9
9. 9 × 5/6 + 5/6 = 25/3
10. 3/4 × 8/9 - 1/3 = 1/3
11. 7 × 5/49 + 3/14 = 13/14
12. 6 ×（ 1/2 + 2/3 ）= 7
13. 8 × 4/5 + 8 × 11/5 = 24
14. 31 × 5/6 – 5/6 = 25
15. 9/7 - （ 2/7 – 10/21 ）= 31/21
16. 5/9 × 18 – 14 × 2/7 = 6
17. 4/5 × 25/16 + 2/3 × 3/4 = 7/4
18. 14 × 8/7 – 5/6 × 12/15 = 46/3
19. 17/32 – 3/4 × 9/24 = 13/16
20. 3 × 2/9 + 1/3 = 1
21. 5/7 × 3/25 + 3/7 = 18/35
22. 3/14 × 2/3 + 1/6 = 13/42
23. 1/5 × 2/3 + 5/6 = 29/30
24. 9/22 + 1/11 ÷ 1/2 = 13/22
25. 5/3 × 11/5 + 4/3 = 5
26. 45 × 2/3 + 1/3 × 15 = 35
27. 7/19 + 12/19 × 5/6 = 17/19
28. 1/4 + 3/4 ÷ 2/3 =11/8
29. 8/7 × 21/16 + 1/2 = 2
30. 101 × 1/5 – 1/5 × 21 = 16
31.50＋160÷40 （58+360）÷（64-45） = 138
32.120-144÷18+35 = 147
33.347+45×2-4160÷52 = 357
34（58+37）÷（64-9×5） = 5
35.95÷（64-45） = 5
36.178-145÷5×6+42 = 46
37.812-700÷（9+31×11）= 810
38.85+14×（14+208÷26） = 393
39.（284+16）×（512-8208÷18）= 16800
40.120-36×4÷18+35 = 147
41.（58+37）÷（64-9×5） = 5
42.(6.8-6.8×0.55)÷8.5 = 0.36
43.0.12× 4.8÷0.12×4.8 = 23.04
44.（3.2×1.5+2.5）÷1.6 = 4.5625
45.6-1.6÷4 = 5.6
46.7.2÷0.8-1.2×5 = 3
47.6.5×（4.8-1.2×4）= 0
48.10.15-10.75×0.4-5.7 = 0.15
49.5.8×（3.87-0.13）+4.2×3.74 = 37.4
50.32.52-（6+9.728÷3.2）×2.5 = 9.92
51.-5+58+13+90+78-(-56)+50 = 340
52.-7*2-57/3 = -33
53.(-7)*2/(1/3)+79/(3+6/4) = 59.556
54.123+456+789+98/(-4) = 1343.5
55.369/3-(-54-31/15.5) = 179
56.39+{3x[42/2x(3x8)]} = 1551
57.9x8x7/5x(4+6) = 1008
58.11x22/(4+12/2) = 24.2
59.94+(-60)/10 = 100
12*45+15*28+30*26+60*11
=12*15*3+15*28+2*15*26+15*4*11
=15*(12*3+28+26*2+4*11)
=15*160
=3*5*160
=800*3
=2400
197*198—196*199
=197*198-196*(198+1)
=197*198-196*198-196
=198*(197-196)-196
=198-196
=2
999×999+1999
=1000*999-999+1999
=999000+(1999-999)
=999000+1000
=1000000
：（100+99*1）+（99+99*2）+（98+99*3）+……+（2+99*99）+（1+99*100）
=(100+99+98+.....+1)+99*1+99*2+99*3+....+99*100
=(100+1)*100/2+99*1+99*2+99*3+....+99*100
=5050+99*(1+2+3+...+100)
=5050+99*5050
=5050*(1+99)
=5050*100
=505000
9+99+999+……+8个9+9个9
=10+100+1000+...+1000000000-9
=1111111110-9
=1111111101
(1). (x+y-z)+(x-y+z)-(x-y-z)
=x+y-z+x-y+z-x+y+z
=x+y+z
(2). (a^2+2ab+b^2)-(a^2-2ab+b^2)
= a^2+2ab+b^2 - a^2+2ab-b^2
=4ab
(3).3(2x^2-y^2)-2(3y^2-2x^2)
=6x^2-3y^2-6y^2+4x^2
=10x^2-9y^2
5. 6÷ 3/8 – 3/8 ÷6 = 255/16
6. 4/7 × 5/9 + 3/7 × 5/9 = 5/9
7. 5/2 -（ 3/2 + 4/5 ） = 1/5
8. 7/8 + （ 1/8 + 1/9 ） = 10/9
9. 9 × 5/6 + 5/6 = 25/3
10. 3/4 × 8/9 - 1/3 = 1/3
11. 7 × 5/49 + 3/14 = 13/14
12. 6 ×（ 1/2 + 2/3 ）= 7
13. 8 × 4/5 + 8 × 11/5 = 24
14. 31 × 5/6 – 5/6 = 25
15. 9/7 - （ 2/7 – 10/21 ）= 31/21
16. 5/9 × 18 – 14 × 2/7 = 6
17. 4/5 × 25/16 + 2/3 × 3/4 = 7/4
18. 14 × 8/7 – 5/6 × 12/15 = 46/3
19. 17/32 – 3/4 × 9/24 = 13/16
20. 3 × 2/9 + 1/3 = 1
21. 5/7 × 3/25 + 3/7 = 18/35
22. 3/14 × 2/3 + 1/6 = 13/42
23. 1/5 × 2/3 + 5/6 = 29/30
24. 9/22 + 1/11 ÷ 1/2 = 13/22
25. 5/3 × 11/5 + 4/3 = 5
26. 45 × 2/3 + 1/3 × 15 = 35
27. 7/19 + 12/19 × 5/6 = 17/19
28. 1/4 + 3/4 ÷ 2/3 =11/8
29. 8/7 × 21/16 + 1/2 = 2
30. 101 × 1/5 – 1/5 × 21 = 16
31.50＋160÷40 （58+360）÷（64-45） = 138
32.120-144÷18+35 = 147
33.347+45×2-4160÷52 = 357
34（58+37）÷（64-9×5） = 5
35.95÷（64-45） = 5
36.178-145÷5×6+42 = 46
37.812-700÷（9+31×11）= 810
38.85+14×（14+208÷26） = 393
39.（284+16）×（512-8208÷18）= 16800
40.120-36×4÷18+35 = 147
41.（58+37）÷（64-9×5） = 5
42.(6.8-6.8×0.55)÷8.5 = 0.36
43.0.12× 4.8÷0.12×4.8 = 23.04
44.（3.2×1.5+2.5）÷1.6 = 4.5625
45.6-1.6÷4 = 5.6
46.7.2÷0.8-1.2×5 = 3
47.6.5×（4.8-1.2×4）= 0
48.10.15-10.75×0.4-5.7 = 0.15
49.5.8×（3.87-0.13）+4.2×3.74 = 37.4
50.32.52-（6+9.728÷3.2）×2.5 = 9.92
51.-5+58+13+90+78-(-56)+50 = 340
52.-7*2-57/3 = -33
53.(-7)*2/(1/3)+79/(3+6/4) = 59.556
54.123+456+789+98/(-4) = 1343.5
55.369/3-(-54-31/15.5) = 179
56.39+{3x[42/2x(3x8)]} = 1551
57.9x8x7/5x(4+6) = 1008
58.11x22/(4+12/2) = 24.2
59.94+(-60)/10 = 100
12*45+15*28+30*26+60*11
=12*15*3+15*28+2*15*26+15*4*11
=15*(12*3+28+26*2+4*11)
=15*160
=3*5*160
=800*3
=2400
197*198—196*199
=197*198-196*(198+1)
=197*198-196*198-196
=198*(197-196)-196
=198-196
=2
999×999+1999
=1000*999-999+1999
=999000+(1999-999)
=999000+1000
=1000000
：（100+99*1）+（99+99*2）+（98+99*3）+……+（2+99*99）+（1+99*100）
=(100+99+98+.....+1)+99*1+99*2+99*3+....+99*100
=(100+1)*100/2+99*1+99*2+99*3+....+99*100
=5050+99*(1+2+3+...+100)
=5050+99*5050
=5050*(1+99)
=5050*100
=505000
9+99+999+……+8个9+9个9
=10+100+1000+...+1000000000-9
=1111111110-9
=1111111101
(1). (x+y-z)+(x-y+z)-(x-y-z)
=x+y-z+x-y+z-x+y+z
=x+y+z
(2). (a^2+2ab+b^2)-(a^2-2ab+b^2)
= a^2+2ab+b^2 - a^2+2ab-b^2
=4ab
(3).3(2x^2-y^2)-2(3y^2-2x^2)
=6x^2-3y^2-6y^2+4x^2
=10x^2-9y^2
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展开全部
64x+207=169
127x+61=117
78x+15=78
253x+161=165
18x+255=217
178x+115=178
97x+5=9
121x+105=74
45x+5=113
55x+146=4
12x+111=174
145x+105=213
208x+95=57
221x+107=65
83x+205=57
51x+195=157
118x+55=118
36x+200=204
57x+38=1
218x+155=218
188x+149=1
202x+40=161
178x+45=153
147x+34=252
210x+144=200
109x+250=208
226x+92=201
195x+82=44
5x+199=5
180x+88=92
204x+189=157
128x+88=197
191x+78=40
254x+188=244
153x+38=252
14x+136=245
239x+126=88
49x+242=49
20x+236=88
34x+128=248
10x+132=240
234x+122=84
41x+232=32
249x+186=249
167x+75=79
188x+169=132
93x+30=93
63x+24=132
126x+13=232
189x+123=180
140x+78=141
111x+71=180
174x+61=23
237x+171=227
188x+126=188
159x+119=228
222x+109=71
29x+219=19
236x+174=236
207x+167=20
14x+157=119
28x+169=127
145x+11=120
114x+1=219
180x+117=180
151x+111=219
214x+101=63
21x+211=11
228x+165=228
199x+159=11
5x+149=111
68x+3=59
20x+213=20
246x+207=59
53x+196=159
116x+50=107
68x+5=68
38x+255=107
101x+244=206
164x+98=154
115x+53=115
86x+46=155
149x+36=254
212x+146=202
163x+101=163
134x+94=203
197x+84=46
4x+194=250
211x+148=211
182x+142=251
245x+132=94
52x+242=42
3x+196=3
23x+32=238
176x+134=50
173x+180=194
189x+76=38
252x+186=242
203x+140=203
174x+134=242
236x+124=86
43x+233=34
251x+188=251
221x+182=34
28x+171=134
143x+130=35
133x+229=30
246x+184=247
217x+177=30
76x+16=82
181x+21=77
35x+225=25
239x+173=229
190x+128=190
213x+226=183
130x+111=73
31x+221=21
235x+169=225
186x+123=186
157x+117=226
16x+211=22
121x+217=17
231x+165=221
179x+113=169
130x+67=130
101x+61=169
216x+155=222
64x+161=217
174x+109=165
126x+63=126
96x+57=165
159x+46=9
19x+5=166
8x+104=161
118x+52=109
69x+7=70
40x+256=109
155x+95=161
4x+100=156
114x+48=104
65x+3=65
85x+94=45
238x+196=113
235x+242=1
251x+138=100
110x+96=1
100x+196=252
213x+150=213
184x+144=253
43x+238=49
148x+244=44
2x+192=248
2x+244=149
248x+88=144
154x+140=45
196x+20=181
23x+120=176
186x+172=77
228x+52=213
55x+151=208
169x+106=169
188x+198=148
85x+44=216
82x+90=104
150x+90=156
255x+95=151
109x+43=99
109x+96=256
99x+195=251
212x+150=212
235x+248=205
152x+133=95
105x+92=252
95x+191=247
205x+139=195
205x+191=96
195x+35=91
52x+245=52
72x+81=31
225x+183=100
222x+229=243
34x+229=40
139x+235=35
45x+31=192
34x+131=187
144x+79=135
145x+131=36
138x+237=44
63x+73=23
216x+175=91
10x+69=188
135x+116=79
88x+75=236
179x+53=55
146x+106=215
5x+201=11
110x+206=6
220x+154=210
220x+207=111
213x+57=119
139x+148=99
36x+250=167
85x+145=8
211x+192=154
164x+150=55
154x+250=50
60x+46=207
50x+146=202
212x+198=103
202x+42=98
108x+94=255
150x+230=135
30x+110=15
114x+210=10
20x+6=167
62x+142=47
145x+242=42
52x+38=199
41x+137=194
204x+190=95
193x+33=90
152x+190=200
47x+34=195
89x+170=74
18x+148=150
241x+201=54
149x+138=234
69x+29=138
184x+124=190
33x+129=185
195x+182=86
188x+32=94
114x+123=74
60x+67=82
79x+225=194
214x+223=174
111x+69=242
160x+220=83
79x+109=169
2x+75=86
4x+63=182
179x+209=13
102x+175=185
104x+163=26
22x+53=113
202x+19=29
204x+7=126
73x+54=17
27x+13=174
69x+149=54
201x+22=177
58x+181=33
30x+177=146
165x+174=125
111x+118=133
130x+21=245
61x+123=178
117x+30=45
39x+182=144
154x+141=45
196x+21=181
24x+120=176
186x+172=77
228x+52=213
108x+188=93
192x+32=88
98x+84=245
140x+220=125
20x+100=5
104x+200=256
10x+252=157
52x+132=37
188x+12=173
16x+112=168
178x+164=69
220x+44=205
96x+174=72
161x+234=244
163x+222=85
81x+111=172
53x+176=28
26x+172=141
160x+170=120
106x+114=128
174x+114=180
75x+156=60
159x+255=55
65x+52=212
107x+188=92
243x+68=228
123x+204=108
3x+84=244
188x+62=64
207x+220=177
176x+209=20
168x+245=143
25x+147=256
46x+241=52
203x+27=188
83x+163=68
167x+7=63
125x+164=173
21x+7=168
60x+137=35
124x+197=207
126x+185=48
44x+75=135
17x+139=247
38x+233=44
195x+19=180
75x+155=60
211x+35=196
91x+171=76
227x+51=212
103x+180=79
167x+241=251
170x+229=92
88x+118=178
60x+183=35
81x+21=87
238x+63=223
118x+199=103
254x+79=239
134x+215=119
14x+95=255
147x+224=122
4x+126=235
25x+221=31
182x+6=167
62x+142=47
198x+22=183
78x+158=63
214x+38=199
91x+168=66
204x+70=179
225x+164=231
126x+206=111
6x+86=247
142x+222=127
22x+102=7
158x+238=143
35x+112=10
148x+14=122
169x+108=175
70x+150=55
2x+135=144
244x+227=126
8x+130=238
29x+224=35
127x+61=117
78x+15=78
253x+161=165
18x+255=217
178x+115=178
97x+5=9
121x+105=74
45x+5=113
55x+146=4
12x+111=174
145x+105=213
208x+95=57
221x+107=65
83x+205=57
51x+195=157
118x+55=118
36x+200=204
57x+38=1
218x+155=218
188x+149=1
202x+40=161
178x+45=153
147x+34=252
210x+144=200
109x+250=208
226x+92=201
195x+82=44
5x+199=5
180x+88=92
204x+189=157
128x+88=197
191x+78=40
254x+188=244
153x+38=252
14x+136=245
239x+126=88
49x+242=49
20x+236=88
34x+128=248
10x+132=240
234x+122=84
41x+232=32
249x+186=249
167x+75=79
188x+169=132
93x+30=93
63x+24=132
126x+13=232
189x+123=180
140x+78=141
111x+71=180
174x+61=23
237x+171=227
188x+126=188
159x+119=228
222x+109=71
29x+219=19
236x+174=236
207x+167=20
14x+157=119
28x+169=127
145x+11=120
114x+1=219
180x+117=180
151x+111=219
214x+101=63
21x+211=11
228x+165=228
199x+159=11
5x+149=111
68x+3=59
20x+213=20
246x+207=59
53x+196=159
116x+50=107
68x+5=68
38x+255=107
101x+244=206
164x+98=154
115x+53=115
86x+46=155
149x+36=254
212x+146=202
163x+101=163
134x+94=203
197x+84=46
4x+194=250
211x+148=211
182x+142=251
245x+132=94
52x+242=42
3x+196=3
23x+32=238
176x+134=50
173x+180=194
189x+76=38
252x+186=242
203x+140=203
174x+134=242
236x+124=86
43x+233=34
251x+188=251
221x+182=34
28x+171=134
143x+130=35
133x+229=30
246x+184=247
217x+177=30
76x+16=82
181x+21=77
35x+225=25
239x+173=229
190x+128=190
213x+226=183
130x+111=73
31x+221=21
235x+169=225
186x+123=186
157x+117=226
16x+211=22
121x+217=17
231x+165=221
179x+113=169
130x+67=130
101x+61=169
216x+155=222
64x+161=217
174x+109=165
126x+63=126
96x+57=165
159x+46=9
19x+5=166
8x+104=161
118x+52=109
69x+7=70
40x+256=109
155x+95=161
4x+100=156
114x+48=104
65x+3=65
85x+94=45
238x+196=113
235x+242=1
251x+138=100
110x+96=1
100x+196=252
213x+150=213
184x+144=253
43x+238=49
148x+244=44
2x+192=248
2x+244=149
248x+88=144
154x+140=45
196x+20=181
23x+120=176
186x+172=77
228x+52=213
55x+151=208
169x+106=169
188x+198=148
85x+44=216
82x+90=104
150x+90=156
255x+95=151
109x+43=99
109x+96=256
99x+195=251
212x+150=212
235x+248=205
152x+133=95
105x+92=252
95x+191=247
205x+139=195
205x+191=96
195x+35=91
52x+245=52
72x+81=31
225x+183=100
222x+229=243
34x+229=40
139x+235=35
45x+31=192
34x+131=187
144x+79=135
145x+131=36
138x+237=44
63x+73=23
216x+175=91
10x+69=188
135x+116=79
88x+75=236
179x+53=55
146x+106=215
5x+201=11
110x+206=6
220x+154=210
220x+207=111
213x+57=119
139x+148=99
36x+250=167
85x+145=8
211x+192=154
164x+150=55
154x+250=50
60x+46=207
50x+146=202
212x+198=103
202x+42=98
108x+94=255
150x+230=135
30x+110=15
114x+210=10
20x+6=167
62x+142=47
145x+242=42
52x+38=199
41x+137=194
204x+190=95
193x+33=90
152x+190=200
47x+34=195
89x+170=74
18x+148=150
241x+201=54
149x+138=234
69x+29=138
184x+124=190
33x+129=185
195x+182=86
188x+32=94
114x+123=74
60x+67=82
79x+225=194
214x+223=174
111x+69=242
160x+220=83
79x+109=169
2x+75=86
4x+63=182
179x+209=13
102x+175=185
104x+163=26
22x+53=113
202x+19=29
204x+7=126
73x+54=17
27x+13=174
69x+149=54
201x+22=177
58x+181=33
30x+177=146
165x+174=125
111x+118=133
130x+21=245
61x+123=178
117x+30=45
39x+182=144
154x+141=45
196x+21=181
24x+120=176
186x+172=77
228x+52=213
108x+188=93
192x+32=88
98x+84=245
140x+220=125
20x+100=5
104x+200=256
10x+252=157
52x+132=37
188x+12=173
16x+112=168
178x+164=69
220x+44=205
96x+174=72
161x+234=244
163x+222=85
81x+111=172
53x+176=28
26x+172=141
160x+170=120
106x+114=128
174x+114=180
75x+156=60
159x+255=55
65x+52=212
107x+188=92
243x+68=228
123x+204=108
3x+84=244
188x+62=64
207x+220=177
176x+209=20
168x+245=143
25x+147=256
46x+241=52
203x+27=188
83x+163=68
167x+7=63
125x+164=173
21x+7=168
60x+137=35
124x+197=207
126x+185=48
44x+75=135
17x+139=247
38x+233=44
195x+19=180
75x+155=60
211x+35=196
91x+171=76
227x+51=212
103x+180=79
167x+241=251
170x+229=92
88x+118=178
60x+183=35
81x+21=87
238x+63=223
118x+199=103
254x+79=239
134x+215=119
14x+95=255
147x+224=122
4x+126=235
25x+221=31
182x+6=167
62x+142=47
198x+22=183
78x+158=63
214x+38=199
91x+168=66
204x+70=179
225x+164=231
126x+206=111
6x+86=247
142x+222=127
22x+102=7
158x+238=143
35x+112=10
148x+14=122
169x+108=175
70x+150=55
2x+135=144
244x+227=126
8x+130=238
29x+224=35
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