3个回答
2009-11-15
展开全部
75÷〔138÷(100-54)〕 85×(95-1440÷24)
80400-(4300+870÷15) 240×78÷(154-115)
1437×27+27×563 〔75-(12+18)〕÷15
2160÷〔(83-79)×18〕 280+840÷24×5
325÷13×(266-250) 85×(95-1440÷24)
58870÷(105+20×2) 1437×27+27×563
81432÷(13×52+78) [37.85-(7.85+6.4)] ×30
156×[(17.7-7.2)÷3] (947-599)+76×64
36×(913-276÷23) [192-(54+38)]×67
[(7.1-5.6)×0.9-1.15]÷2.5 81432÷(13×52+78)
5.4÷[2.6×(3.7-2.9)+0.62] (947-599)+76×64 60-(9.5+28.9)]÷0.18 2.881÷0.43-0.24×3.5 20×[(2.44-1.8)÷0.4+0.15] 28-(3.4 1.25×2.4) 0.8×〔15.5-(3.21 5.79)〕 (31.8 3.2×4)÷5 194-64.8÷1.8×0.9 36.72÷4.25×9.9 3.416÷(0.016×35) 0.8×[(10-6.76)÷1.2]
(136+64)×(65-345÷23) (6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8 (58+37)÷(64-9×5)
812-700÷(9+31×11) (3.2×1.5+2.5)÷1.6
85+14×(14+208÷26) 120-36×4÷18+35
(284+16)×(512-8208÷18) 9.72×1.6-18.305÷7
4/7÷[1/3×(3/5-3/10)] (4/5+1/4)÷7/3+7/10
12.78-0÷( 13.4+156.6 ) 37.812-700÷(9+31×11) (136+64)×(65-345÷23) 3.2×(1.5+2.5)÷1.6
85+14×(14+208÷26) (58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5 (284+16)×(512-8208÷18)
0.12× 4.8÷0.12×4.8 (3.2×1.5+2.5)÷1.6
120-36×4÷18+35 10.15-10.75×0.4-5.7
5.8×(3.87-0.13)+4.2×3.74 347+45×2-4160÷52
32.52-(6+9.728÷3.2)×2.5 87(58+37)÷(64-9×5)
[(7.1-5.6)×0.9-1.15] ÷2.5 (3.2×1.5+2.5)÷1.6
5.4÷[2.6×(3.7-2.9)+0.62] 12×6÷(12-7.2)-6
3.2×6+(1.5+2.5)÷1.6 (3.2×1.5+2.5)÷1.6
5.8×(3.87-0.13)+4.2×3.74
33.02-(148.4-90.85)÷2.5
回答者: 754791551 - 魔法学徒 一级 10-5 13:26
(一)计算题:
(1)23+(-73)
(2)(-84)+(-49)
(3)7+(-2.04)
(4)4.23+(-7.57)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)3.75+(2.25)+5/4
(8)-3.75+(+5/4)+(-1.5)
(9)(-17/4)+(-10/3)+(+13/3)+(11/3)
(10)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
(11)(+1.3)-(+17/7)
(12)(-2)-(+2/3)
(13)|(-7.2)-(-6.3)+(1.1)|
(14)|(-5/4)-(-3/4)|-|1-5/4-|-3/4|)
(15)(-2/199)*(-7/6-3/2+8/3)
(16)4a)*(-3b)*(5c)*1/6
还有50道题,不过没有答案
1. 3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
0.12χ+1.8×0.9=7.2 (9-5χ)×0.3=1.02 6.4χ-χ=28+4.4
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
19. 17/32 – 3/4 × 9/24
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
48.10.15-10.75×0.4-5.7
49.5.8×(3.87-0.13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
51.-5+58+13+90+78-(-56)+50
52.-7*2-57/(3
53.(-7)*2/(1/3)+79/(3+6/4)
54.123+456+789+98/(-4)
55.369/33-(-54-31/15.5)
56.39+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58.11x22/(4+12/2)
59.94+(-60)/10
80400-(4300+870÷15) 240×78÷(154-115)
1437×27+27×563 〔75-(12+18)〕÷15
2160÷〔(83-79)×18〕 280+840÷24×5
325÷13×(266-250) 85×(95-1440÷24)
58870÷(105+20×2) 1437×27+27×563
81432÷(13×52+78) [37.85-(7.85+6.4)] ×30
156×[(17.7-7.2)÷3] (947-599)+76×64
36×(913-276÷23) [192-(54+38)]×67
[(7.1-5.6)×0.9-1.15]÷2.5 81432÷(13×52+78)
5.4÷[2.6×(3.7-2.9)+0.62] (947-599)+76×64 60-(9.5+28.9)]÷0.18 2.881÷0.43-0.24×3.5 20×[(2.44-1.8)÷0.4+0.15] 28-(3.4 1.25×2.4) 0.8×〔15.5-(3.21 5.79)〕 (31.8 3.2×4)÷5 194-64.8÷1.8×0.9 36.72÷4.25×9.9 3.416÷(0.016×35) 0.8×[(10-6.76)÷1.2]
(136+64)×(65-345÷23) (6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8 (58+37)÷(64-9×5)
812-700÷(9+31×11) (3.2×1.5+2.5)÷1.6
85+14×(14+208÷26) 120-36×4÷18+35
(284+16)×(512-8208÷18) 9.72×1.6-18.305÷7
4/7÷[1/3×(3/5-3/10)] (4/5+1/4)÷7/3+7/10
12.78-0÷( 13.4+156.6 ) 37.812-700÷(9+31×11) (136+64)×(65-345÷23) 3.2×(1.5+2.5)÷1.6
85+14×(14+208÷26) (58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5 (284+16)×(512-8208÷18)
0.12× 4.8÷0.12×4.8 (3.2×1.5+2.5)÷1.6
120-36×4÷18+35 10.15-10.75×0.4-5.7
5.8×(3.87-0.13)+4.2×3.74 347+45×2-4160÷52
32.52-(6+9.728÷3.2)×2.5 87(58+37)÷(64-9×5)
[(7.1-5.6)×0.9-1.15] ÷2.5 (3.2×1.5+2.5)÷1.6
5.4÷[2.6×(3.7-2.9)+0.62] 12×6÷(12-7.2)-6
3.2×6+(1.5+2.5)÷1.6 (3.2×1.5+2.5)÷1.6
5.8×(3.87-0.13)+4.2×3.74
33.02-(148.4-90.85)÷2.5
回答者: 754791551 - 魔法学徒 一级 10-5 13:26
(一)计算题:
(1)23+(-73)
(2)(-84)+(-49)
(3)7+(-2.04)
(4)4.23+(-7.57)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)3.75+(2.25)+5/4
(8)-3.75+(+5/4)+(-1.5)
(9)(-17/4)+(-10/3)+(+13/3)+(11/3)
(10)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
(11)(+1.3)-(+17/7)
(12)(-2)-(+2/3)
(13)|(-7.2)-(-6.3)+(1.1)|
(14)|(-5/4)-(-3/4)|-|1-5/4-|-3/4|)
(15)(-2/199)*(-7/6-3/2+8/3)
(16)4a)*(-3b)*(5c)*1/6
还有50道题,不过没有答案
1. 3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
0.12χ+1.8×0.9=7.2 (9-5χ)×0.3=1.02 6.4χ-χ=28+4.4
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
19. 17/32 – 3/4 × 9/24
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
48.10.15-10.75×0.4-5.7
49.5.8×(3.87-0.13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
51.-5+58+13+90+78-(-56)+50
52.-7*2-57/(3
53.(-7)*2/(1/3)+79/(3+6/4)
54.123+456+789+98/(-4)
55.369/33-(-54-31/15.5)
56.39+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58.11x22/(4+12/2)
59.94+(-60)/10
展开全部
有理数的运算练习题
(一)填空
4.23-17-(+23)=______.
5.-7-9+(-13)=______.
6.-11+|12-(39-8)|=______.
7.-9-|5-(9-45)|=______.
8.-5.6+4.7-|-3.8-3.8|=______.
9.-|-0.2|+[0.6-(0.8-5.4)]=______.
12.9.53-8-(2-|-11.64+1.53-1.36|)=______.
13.73.17-(812.03-|219.83+518|)=______.
25.已知2.342=5.476,那么-0.13×(-234)2=______.
26.若有理数m<n<0,则m3•n2的符号为______.
28.935的末位数字是______.
32.(37-34)5÷64×(-82)=______.
34.365×[72-23×7+(-24)]=______.
36.38×(-7)+5[(-2)3(-32)-(-22)]-38×339÷(-3)38=______.
______.
48.(-2)×{(-3)×[(-5)+2×(0.3-0.3)÷83-3]+4}=______.
50.用四舍五入法取近似值,396.7精确到十位的近似数是______;保留两个有效数字的近似数是______.
51.用四舍五入法取近似值,0.01249精确到0.001的近似数是______;保留三个有效数字的近似数是______.
52.今有17.5吨煤,若一辆汽车最多运4吨,则需至少派______辆汽车可一次将煤运走.
53.若8.662=75,则8662=______.
54.若2.07143=8.888,则0.20714=______.
(二)选择
55.不能使式|-11.3+______|=|-11.3|+|______|成立的数是 [ ]
A.任意一个数;
B.任意一个正数;
C.任一个负数;
D.任一个非负数.
56.不能使式|-0.19-______|=|-0.19|+|______|成立的数是 [ ]
A.任一个负数;
B.任一个非负数;
C.任一个正数;
D.任一个非正数.
57.不能使式|-7.31+______|=|-7.31|+|______|成立的数是 [ ]
A.任一个负数;
B.任一个非负数;
C.任一个正数;
D.任一个非正数.
[ ]
A.任意一个数;
C.任意一个负数;
D.任意一个非负数.
59.11.3-22.7+7.3等于 [ ]
A.-4.1;
B.-18.7;
C.-4.4;
D.-18.4.
[ ]
A.-11.7;
B.-10.1;
C.-8.1;
D.-10.3.
[ ]
A.2.2;
B.-3.2;
C.-2.2;
D.3.2.
62.-{66-[-6+(4-84-24)]}等于 [ ]
A.-168;
B.-176;
C.-116;
D.-124.
[ ]
[ ]
A.1;
B.-1;
C.0;
D.3.
65.-793.8-[3.8-(178.2-0.2)]等于 [ ]
A.-620.4;
B.-615;
C.-619.6;
D.-611.6.
[ ]
[ ]
[ ]
A.1;
D.0.1
69.-0.32÷0.5×2÷(-2)2的值是 [ ]
[ ]
71.(-0.3)3÷(-0.1)2×(-0.012)÷(-34)的值是 [ ]
72.若a•b<|a•b|,则下列结论正确的是 [ ]
A.a<0,b<0;
B.a>0,b<0;
C.a<0,b>0;
D.a•b<0.
73.下列不等式中正确的是 [ ]
A.-22×32>-22×3>-2×32>(-2×3)2;
B.(-2×3)2>-22×3>-2×32>-22×32;
C.-2×32>-22×3>-22×32>(-2×3)2;
D.-22×3>-22×32>(-2×3)2>-2×32.
74.(2002-1002)÷104的结果是 [ ]
A.1;
B.2;
C.3;
D.以上都不对.
75.下列数中与(-7-2)5相等的数是 [ ]
A.(-7)5+(-2)5;
B.-145;
C.310;
D.-310.
76.下列各数中与2×64×(-29)相等的数是 [ ]
A.216;
B.-216;
C.-254;
D.-384.
77.下列各数中比0小的偶数是 [ ]
A.(-5-2)3;
B.(-3)3(-2)3;
C.(-1+32)3;
D.(-3)4(-2)3.
小的数是 [ ]
A.这个数;
B.这个数的相反数;
C.这个数的倒数;
D.这个数的绝对值.
79.下列各式中正确的式子是 [ ]
80.下列各式中正确的式子是 [ ]
A.(-3-2)3=33×23;
B.144÷12×12=1;
C.(32)4-(34)2=0;
D.(-3)3(-2)3=-63.
81.下列各式中错误的式子是 [ ]
A.(33)2=36;
B.28-27=27;
D.2×32×37+33×36=310.
82.下列各数中最大的数是 [ ]
A.3×32-2×22;
B.(3×3)2-(2×2)2;
C.(33)2-(22)2;
D.(33)2-(22)2.
83.下列各数中最小的数是 [ ]
A.(-3-2)3;
B.(-3)(-2)3;
C.(-3)3÷(-2)3;
D.(-3)3(-2)3.
[ ]
85.如果(-ab)125>0,则下列正确的是 [ ]
C.a>0,b<0;
D.a<0,b>0.
86.如果等式a=a2成立,则a可能的取值是 [ ]
A.1个;
B.2个;
C.3个;
D.以上结论都不对.
87.a为任意整数,则下列四组数中的数字都不可能是a2的末位数字的应是 [ ]
A.3,4,9,0;
B.2,3,7,8;
C.4,5,6,7;
D.1,5,6,9.
88.四个各不相等的整数a,b,c,d,它们的积a•b•c•d=9,那么a+b+c+d的值是 [ ]
A.0;
B.4;
C.8;
D.不能确定.
[ ]
A.2;
B.4;
[ ]
A.大于零;
B.小于零;
C.等于零;
D.以上三种情况都有可能.
91.已知n是自然数,(-7)n+8=-335,则n的值是 [ ]
A.-3;
B.3;
C.2;
D.-2.
92.已知(a-1)2+3=7,则a的值是 [ ]
A.-1;
B.3;
C.-1或3;
D.以上均不对.
[ ]
[ ]
A.0.25;
B.2.5;
C.2500;
D.25000.
[ ]
A.-0.00125;
B.0.00125;
C.-0.00005;
D.0.0005.
[ ]
A.16;
B.-16;
C.1;
D.-1.
97.3.6÷(-0.62)÷0.62×(-6)3的值是 [ ]
A.6000;
B.-6000;
C.-600;
D.600.
98.对于|-a|b2+ab2,下列说法正确的是 [ ]
A.|-a|b2+ab2恒为正数;
B.|-a|b2+ab2恒为负数;
C.|-a|b2+ab2恒为零;
D.|-a|b2+ab2恒为非负数.
99.已知a=2,b=3,则(ab-ba)(ba+ab)的值是 [ ]
A.17;
B.-17;
C.13;
D.-13.
100.|3+(-2)3×(-3)2+(-23)(-32)|与25的差是 [ ]
A.大于零;
B.小于零;
C.等于零;
D.以上都有可能.
(一)填空
4.23-17-(+23)=______.
5.-7-9+(-13)=______.
6.-11+|12-(39-8)|=______.
7.-9-|5-(9-45)|=______.
8.-5.6+4.7-|-3.8-3.8|=______.
9.-|-0.2|+[0.6-(0.8-5.4)]=______.
12.9.53-8-(2-|-11.64+1.53-1.36|)=______.
13.73.17-(812.03-|219.83+518|)=______.
25.已知2.342=5.476,那么-0.13×(-234)2=______.
26.若有理数m<n<0,则m3•n2的符号为______.
28.935的末位数字是______.
32.(37-34)5÷64×(-82)=______.
34.365×[72-23×7+(-24)]=______.
36.38×(-7)+5[(-2)3(-32)-(-22)]-38×339÷(-3)38=______.
______.
48.(-2)×{(-3)×[(-5)+2×(0.3-0.3)÷83-3]+4}=______.
50.用四舍五入法取近似值,396.7精确到十位的近似数是______;保留两个有效数字的近似数是______.
51.用四舍五入法取近似值,0.01249精确到0.001的近似数是______;保留三个有效数字的近似数是______.
52.今有17.5吨煤,若一辆汽车最多运4吨,则需至少派______辆汽车可一次将煤运走.
53.若8.662=75,则8662=______.
54.若2.07143=8.888,则0.20714=______.
(二)选择
55.不能使式|-11.3+______|=|-11.3|+|______|成立的数是 [ ]
A.任意一个数;
B.任意一个正数;
C.任一个负数;
D.任一个非负数.
56.不能使式|-0.19-______|=|-0.19|+|______|成立的数是 [ ]
A.任一个负数;
B.任一个非负数;
C.任一个正数;
D.任一个非正数.
57.不能使式|-7.31+______|=|-7.31|+|______|成立的数是 [ ]
A.任一个负数;
B.任一个非负数;
C.任一个正数;
D.任一个非正数.
[ ]
A.任意一个数;
C.任意一个负数;
D.任意一个非负数.
59.11.3-22.7+7.3等于 [ ]
A.-4.1;
B.-18.7;
C.-4.4;
D.-18.4.
[ ]
A.-11.7;
B.-10.1;
C.-8.1;
D.-10.3.
[ ]
A.2.2;
B.-3.2;
C.-2.2;
D.3.2.
62.-{66-[-6+(4-84-24)]}等于 [ ]
A.-168;
B.-176;
C.-116;
D.-124.
[ ]
[ ]
A.1;
B.-1;
C.0;
D.3.
65.-793.8-[3.8-(178.2-0.2)]等于 [ ]
A.-620.4;
B.-615;
C.-619.6;
D.-611.6.
[ ]
[ ]
[ ]
A.1;
D.0.1
69.-0.32÷0.5×2÷(-2)2的值是 [ ]
[ ]
71.(-0.3)3÷(-0.1)2×(-0.012)÷(-34)的值是 [ ]
72.若a•b<|a•b|,则下列结论正确的是 [ ]
A.a<0,b<0;
B.a>0,b<0;
C.a<0,b>0;
D.a•b<0.
73.下列不等式中正确的是 [ ]
A.-22×32>-22×3>-2×32>(-2×3)2;
B.(-2×3)2>-22×3>-2×32>-22×32;
C.-2×32>-22×3>-22×32>(-2×3)2;
D.-22×3>-22×32>(-2×3)2>-2×32.
74.(2002-1002)÷104的结果是 [ ]
A.1;
B.2;
C.3;
D.以上都不对.
75.下列数中与(-7-2)5相等的数是 [ ]
A.(-7)5+(-2)5;
B.-145;
C.310;
D.-310.
76.下列各数中与2×64×(-29)相等的数是 [ ]
A.216;
B.-216;
C.-254;
D.-384.
77.下列各数中比0小的偶数是 [ ]
A.(-5-2)3;
B.(-3)3(-2)3;
C.(-1+32)3;
D.(-3)4(-2)3.
小的数是 [ ]
A.这个数;
B.这个数的相反数;
C.这个数的倒数;
D.这个数的绝对值.
79.下列各式中正确的式子是 [ ]
80.下列各式中正确的式子是 [ ]
A.(-3-2)3=33×23;
B.144÷12×12=1;
C.(32)4-(34)2=0;
D.(-3)3(-2)3=-63.
81.下列各式中错误的式子是 [ ]
A.(33)2=36;
B.28-27=27;
D.2×32×37+33×36=310.
82.下列各数中最大的数是 [ ]
A.3×32-2×22;
B.(3×3)2-(2×2)2;
C.(33)2-(22)2;
D.(33)2-(22)2.
83.下列各数中最小的数是 [ ]
A.(-3-2)3;
B.(-3)(-2)3;
C.(-3)3÷(-2)3;
D.(-3)3(-2)3.
[ ]
85.如果(-ab)125>0,则下列正确的是 [ ]
C.a>0,b<0;
D.a<0,b>0.
86.如果等式a=a2成立,则a可能的取值是 [ ]
A.1个;
B.2个;
C.3个;
D.以上结论都不对.
87.a为任意整数,则下列四组数中的数字都不可能是a2的末位数字的应是 [ ]
A.3,4,9,0;
B.2,3,7,8;
C.4,5,6,7;
D.1,5,6,9.
88.四个各不相等的整数a,b,c,d,它们的积a•b•c•d=9,那么a+b+c+d的值是 [ ]
A.0;
B.4;
C.8;
D.不能确定.
[ ]
A.2;
B.4;
[ ]
A.大于零;
B.小于零;
C.等于零;
D.以上三种情况都有可能.
91.已知n是自然数,(-7)n+8=-335,则n的值是 [ ]
A.-3;
B.3;
C.2;
D.-2.
92.已知(a-1)2+3=7,则a的值是 [ ]
A.-1;
B.3;
C.-1或3;
D.以上均不对.
[ ]
[ ]
A.0.25;
B.2.5;
C.2500;
D.25000.
[ ]
A.-0.00125;
B.0.00125;
C.-0.00005;
D.0.0005.
[ ]
A.16;
B.-16;
C.1;
D.-1.
97.3.6÷(-0.62)÷0.62×(-6)3的值是 [ ]
A.6000;
B.-6000;
C.-600;
D.600.
98.对于|-a|b2+ab2,下列说法正确的是 [ ]
A.|-a|b2+ab2恒为正数;
B.|-a|b2+ab2恒为负数;
C.|-a|b2+ab2恒为零;
D.|-a|b2+ab2恒为非负数.
99.已知a=2,b=3,则(ab-ba)(ba+ab)的值是 [ ]
A.17;
B.-17;
C.13;
D.-13.
100.|3+(-2)3×(-3)2+(-23)(-32)|与25的差是 [ ]
A.大于零;
B.小于零;
C.等于零;
D.以上都有可能.
参考资料: http://www.sjhy365.com.cn/uploadFile/2008050810001204643985.doc
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12+(-6)-(-21)*6 36/12-(-32)+[-(-8)]
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