谁有一些脱式计算题 100
3个回答
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1.(1/69+2/71)乘23+25除以71
=1/69*23+2/71*23+25/71
=1/3+(46/71+25/71)
=1/3+1
=4/3
2.(1+1/2)乘(1-1/2)乘(1+1/3)乘(1-1/3)乘........乘(1+1/9)乘(1-1/9)
=3/2*1/2*4/3*2/3...*10/9*8/9
=1/2*10/9(中间的都约去了)
=5/9
3.1/2乘3+1/3乘4+.......+1/19乘20
=1/2-1/3+1/3-1/4+...+1/19-1/20
=1/2-1/20
=9/20
4.1/27+505/2727+131313/272727
=1/27+5*101/(27*101)+13*10101/(27*10101)
=1/27+5/27+13/27
=19/27
5.100-98+96-94+....+4-2
=(100-98)+(96-94)+...(4-2)
=2+2+...+2(共有25个)
=2*25
=50
五十二又二十五分之十一×79.45+159×47.56+七十九又二十分之十一×52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=159×100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
=2+2+2+2+……+2+2(从3-2002共2000个数,所以有1000个2)+2+1
=1000×2+2+1
=2003
4,5两题均用到一个转换式1/(A×B)=1/(B-A)×(1/A-1/B)
如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可验证一下
4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11分之一)
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11)
=(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11)
=1-1/11
=10/11
5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
2.8×4-5x=5.8
解:11.2-5X=5.8
5.4=5X
1.08=X
1.6x+2.4=7.2
解:1.6X=4.8
X=3
11.2-5X=5.8
解:5X=5.4
X=1.08
3.4x-6=4.2
解:3.4X=10.2
X=3
7.8x+5=44
解:7.8X=39
X=5
100x+200=400
解:100x=400-200
x=200÷100
x=2
50x+100=200
解: 50x=200-100
x=100÷50
x=2
10x+20=40
解:10x=40-20
x=20÷10
x=2
=1/69*23+2/71*23+25/71
=1/3+(46/71+25/71)
=1/3+1
=4/3
2.(1+1/2)乘(1-1/2)乘(1+1/3)乘(1-1/3)乘........乘(1+1/9)乘(1-1/9)
=3/2*1/2*4/3*2/3...*10/9*8/9
=1/2*10/9(中间的都约去了)
=5/9
3.1/2乘3+1/3乘4+.......+1/19乘20
=1/2-1/3+1/3-1/4+...+1/19-1/20
=1/2-1/20
=9/20
4.1/27+505/2727+131313/272727
=1/27+5*101/(27*101)+13*10101/(27*10101)
=1/27+5/27+13/27
=19/27
5.100-98+96-94+....+4-2
=(100-98)+(96-94)+...(4-2)
=2+2+...+2(共有25个)
=2*25
=50
五十二又二十五分之十一×79.45+159×47.56+七十九又二十分之十一×52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=159×100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
=2+2+2+2+……+2+2(从3-2002共2000个数,所以有1000个2)+2+1
=1000×2+2+1
=2003
4,5两题均用到一个转换式1/(A×B)=1/(B-A)×(1/A-1/B)
如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可验证一下
4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11分之一)
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11)
=(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11)
=1-1/11
=10/11
5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
2.8×4-5x=5.8
解:11.2-5X=5.8
5.4=5X
1.08=X
1.6x+2.4=7.2
解:1.6X=4.8
X=3
11.2-5X=5.8
解:5X=5.4
X=1.08
3.4x-6=4.2
解:3.4X=10.2
X=3
7.8x+5=44
解:7.8X=39
X=5
100x+200=400
解:100x=400-200
x=200÷100
x=2
50x+100=200
解: 50x=200-100
x=100÷50
x=2
10x+20=40
解:10x=40-20
x=20÷10
x=2
展开全部
1)50+160÷40
2)120-144÷18+35
3)347+45×2-4160÷52
4)(58+37)÷(64-9×5)
5)95÷(64-45)
6)178-145÷5×6+42
7)812-700÷(9+31×11)
8)85+14×(14+208÷26)
9)(284+16)×(512-8208÷18)
10)120-36×4÷18+35
11)(58+37)÷(64-9×5)
12)(6.8-6.8×0.55)÷8.5
13)0.12× 4.8÷0.12×4.8
14)(3.2×1.5+2.5)÷1.6
15)3.2×(1.5+2.5)÷1.6
16)6-1.6÷4
17)7.2÷0.8-1.2×5
18)6.5×(4.8-1.2×4)
19)0.68×1.9+0.32×1.9
20)10.15-10.75×0.4-5.7
21)5.8×(3.87-0.13)+4.2×3.74
22)32.52-(6+9.728÷3.2)×2
23)(136+64)×(65-345÷23)
24) 420+580-64×21÷28
25)(58+370)÷(64-45)
2)120-144÷18+35
3)347+45×2-4160÷52
4)(58+37)÷(64-9×5)
5)95÷(64-45)
6)178-145÷5×6+42
7)812-700÷(9+31×11)
8)85+14×(14+208÷26)
9)(284+16)×(512-8208÷18)
10)120-36×4÷18+35
11)(58+37)÷(64-9×5)
12)(6.8-6.8×0.55)÷8.5
13)0.12× 4.8÷0.12×4.8
14)(3.2×1.5+2.5)÷1.6
15)3.2×(1.5+2.5)÷1.6
16)6-1.6÷4
17)7.2÷0.8-1.2×5
18)6.5×(4.8-1.2×4)
19)0.68×1.9+0.32×1.9
20)10.15-10.75×0.4-5.7
21)5.8×(3.87-0.13)+4.2×3.74
22)32.52-(6+9.728÷3.2)×2
23)(136+64)×(65-345÷23)
24) 420+580-64×21÷28
25)(58+370)÷(64-45)
追问
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追答
还要步骤呀
1)50+160÷40
=50+40
=90
2)120-144÷18+35
=120-8+35
=147
3)347+45×2-4160÷52
=347+90-80
=357
4)(58+37)÷(64-9×5)
=95÷19
=5
5)95÷(64-45)
=95÷20
=4.75
6)178-145÷5×6+42
=178-29×6+42
=178-174+42
=46
7)812-700÷(9+31×11)
=812-700÷350
=812-2
=810
8)85+14×(14+208÷26)
=85+14×22
=85+308
=393
9)(284+16)×(512-8208÷18)
=300×(512-456)
=300×56
=16800
10)120-36×4÷18+35
=120-8+35
=147
11)(58+37)÷(64-9×5)
=95÷19
=5
12)(6.8-6.8×0.55)÷8.5
=6.8×0.45÷8.5
=6.8×0.9÷17
=0.4×0.9
=0.36
13)0.12× 4.8÷(0.12×4.8)
=1
14)3.2×(1.5+2.5)÷1.6
=3.2÷1.6×4
=8
15)3.2×(1.5+2.5)÷1.6
=3.2÷1.6×4
=8
16)6-1.6÷4
=6-0.4
=5.6
17)7.2÷0.8-1.2×5
=9-6
=3
18)6.5×(4.8-1.2×4)
=6.5×0
=0
19)0.68×1.9+0.32×1.9
=(0.68+0.32)×1.9
=1.9
20)10.15-10.75×0.4-5.7
=10.15-4.3-5.7
=10.15-10
=0.15
21)5.8×(3.87-0.13)+4.2×3.74
=5.8×3.74+4.2×3.74
=(5.8+4.2)×3.74
=37.4
22)32.52-(6+9.728÷3.2)×2
=32.52-(6+3.04)×2
=32.52-18.08
=14.44
23)(136+64)×(65-345÷23)
=200×(65-15)
=10000
24) 420+580-64×21÷28
=1000-64×21÷4÷7
=1000-16×3
=952
25)(58+360)÷(64-45)
=418÷19
=22
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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
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
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
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
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