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
51.[(7.1-5.6)×0.9-1.15] ÷2.5
52.5.4÷[2.6×(3.7-2.9)+0.62]
53.12×6÷(12-7.2)-6用简便方法计算下面各题
1、89+124+11+26+48 2、875-147-23
3.25×125×40×8 4、147×8+8×53
5、125×64 6、0.9+1.08+0.92+0.1
用简便方法计算
①89+124+11+26+48 ②875-147-23
③147×8+8×53 ④125×64
计算下面各题.
1.280+840÷24×5 2.85×(95-1440÷24)
3.58870÷(105+20×2) 4.80400-(4300+870÷15)
5.1437×27+27×563 6.81432÷(13×52+78)
7.125×(33-1) 8.37.4-(8.6+7.24-6.6)
计算.(1∶1)
(1)156×107-7729 (2)37.85-(7.85+6.4)
(3)287×5+96990÷318 (4)1554÷[(72-58)×3]
2800÷ 100+789 (947-599)+76×64
1.36×(913-276÷23) 2.(93+25×21)×9
3.507÷13×63+498 4.723-(521+504)÷25
5.384÷12+23×371 6.(39-21)×(396÷6)
50道简便计算题及答案(1)2.5*32*0.125 =(2.5*4)*(8*0.125) =10*1 =10 (2)3.5-7+6.5 =3.5+6.5-7 =3 (3)1.2×2.5+0.8×2.5 =2.5(1.2+0.8) =25 (4)8.9×1.25-0.9×1.25 =1.25(8.9-0.9) =10 (5)12.5×7.4×0.8 =12.5×0.8×7.4 =74 (6)6.5×9.5+6.5×0.5 =6.5×(9.5+0.5) =6.5×10 =65 (7)0.35×1.6+0.35×3.4 =0.35*(1.6+3.4) =0.35*5 =1.75 (8)6.72-3.28-1.72 =6.75-(3.28+1.72) =6.75-5 =1.75 (9)0.45+6.37+4.55 =0.45+4.55+6.37 =5+6.37 =11.37 (10)28×12.5-12.5×20 =(28-20)*12.5 =8*12.5 =100 (11)23.65-(3.07+3.65) =23.65-3.65-3.07 =20-3.07 =16.93 (12)(4+0.4×0.25)8×7×1.25 =(4+1)*7*10 =5*7*10 =350 (13)1.65×99+1.65 =1.65*(99+1) =1.65*100 =165 (14)27.85-(7.85+3.4) =27.85-7.85+3.4 =20+3.4 =23.4 (15)48×1.25+50×1.25×0.2×8 7.8×9.9+0.78 =7.8*(9.9+0.1) =7.8*10 =78 (16)4.8×46+4.8×54 =(46+54)*4.8 =100*4.8 =480 (17)673-327-173 =673-(327+173) =673-500 =173 (18)4.44*2.5 =1.11*(4*2.5) =1.11*10 =11.1 (19)3.5÷1.4 =(3.5÷0.7)÷(1.4÷0.7) =5÷2 =2.5 (20)1+2+3+4+5......+99+100 =(1+99)+(2+98)+(3+97)+......+(49+51)+50 =(100÷2-1)*100+50 =4900+50 =4950 ⑴运用加法交换律进行简便计算。 0.88+5.6+0.12=0.88+0.12+5.6=1+5.6=6.6 1.78+3.5+0.22=1.78+0.22+3.5=2+3.5=5.5 5.6+2.08+14.4 =5.6+14.4+2.08=20+2.08=22.08 ⑵运用加法结合律进行简便计算 2.3+(0.56+4.7) =(2.3+4.7)+0.56 =7+0.56 =7.56 28.6+0.54+0.46+1.4 =(28.6+1.4)+(0.54+0.46) =30+1 =31 5.82+4.56+5.44 =5.82+(4.56+5.44) =5.82+10=15.82 ⑶、运用乘法交换律进行简便计算。 25×0.37×0.4=25×0.4×0.37=10×0.37=3.7 7.5×0.39×4 =7.5×4×0.39 =30×0.39 =11.7 6.5×1.1×4 =6.5×4×1.1 =26×1.1 =2.86 1.25×3.9×0.8=1.25×0.8×3.9=1×3.9 =3.9 ⑷、运用乘法结合律进行简便计算。 1.9×7.5×8=1.9×(7.5×8) =1.9×60=114 6.2×0.8×2.5=6.2×(0.8×2.5) =6.2×2 =12.4 4.3×1.5×6=4.3×(1.5×6) =4.3×9 =38.7 4.1×3.5×2 =4.1×(3.5×2)=4.1×7=28.7 ⑸、运用乘法分配律的加法进行简算。 13.6×4.6+4.6×6.4=(13.6+6.4)×4.6=20×4.6 =92 0.72×23+77×0.72 =(23+77)×0.72=100×0.72 =72 2.6×32+32×2.4 =(2.6+2.4) ×32 =5×32 =160 ⑹、运用乘法分配律的减法进行简算。 12×5.9-5.9×2=(12-2) ×5.9 =10×5.9=59 4.6×2.5-2.5×0.6 =(4.6-0.6)×2.5=4×2.5 =10 101×9.7-9.7 =(101-1)×9.7=100×9.7=970 ⑺、运用减法的运算规律进行简便计算。 1.8-0.45-0.55=1.8-(0.45+0.55) =1.8-1 =0.8 54.4-4.6-5.4=54.4-(4.6+5.4) =54.4-10=44.4 35.6-0.13-0.47=35.6-(0.13+0.47)=35.6-0.6=35 ⑻、运用除法的运算规律进行简便计算。 4.5÷4÷7.5=4.5÷(4×7.5)=4.5÷30=0.15 14.8÷1.25÷8=14.8÷(1.25×8)=14.8÷10 =1.48 18.5÷4÷1.25=18.5÷(4×1.25)=18.5÷5 =3.7 5 .4÷4÷0.45 =5.4÷(4×0.45) =5.4÷0.18=30 ⑼综合运用各种运算定律进行简算。 2.54+2.46+0.44+0.54 =(2.54+2.46)+(0.44+0.54)=5+1 =6 10.7×0.4-6.7×0.4=(10.7-6.7)×0.4=4×0.4 =1.6 0.5×3.2×1.25 =(0.5×4)×(0.8×1.25) =2×1 =2乘号写错了,不过值得佩服(1)2.5*32*0.125
=(2.5*4)*(8*0.125)
=10*1
(2)3.5-7+6.5
=3.5+6.5-7
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
(5)12.5×7.4×0.8
=12.5×0.8×7.4
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
(17)673-327-173
=673-(327+173)
=673-500
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950⑴运用加法交换律进行简便计算。
0.88+5.6+0.121.78+3.5+0.225.6+2.08+14.4
=0.88+0.12+5.6=1.78+0.22+3.5=5.6+14.4+2.08
=1+5.6=2+3.5=20+2.08
=6.6=5.5=22.08
⑵运用加法结合律进行简便计算
2.3+(0.56+4.7)28.6+0.54+0.46+1.45.82+4.56+5.44
=(2.3+4.7)+0.56=(28.6+1.4)+(0.54+0.46)=5.82+(4.56+5.44)
=7+0.56=30+1=5.82+10
=7.56=31=15.82
⑶、运用乘法交换律进行简便计算。
25×0.37×0.47.5×0.39×46.5×1.1×41.25×3.9×0.8
=25×0.4×0.37=7.5×4×0.39=6.5×4×1.1=1.25×0.8×3.9
=10×0.37=30×0.39=26×1.1=1×3.9
=3.7=11.7=28.6=3.9
⑷、运用乘法结合律进行简便计算。
1.9×7.5×86.2×0.8×2.54.3×1.5×64.1×3.5×2
=1.9×(7.5×8)=6.2×(0.8×2.5)=4.3×(1.5×6)=4.1×(3.5×2)
=1.9×60=6.2×2=4.3×9=4.1×7
=114=12.4=38.7=28.7
⑸、运用乘法分配律的加法进行简算。
13.6×4.6+4.6×6.40.72×23+77×0.722.6×32+32×2.4
=(13.6+6.4)×4.6=(23+77)×0.72=(2.6+2.4) ×32
=20×6.4=100×0.72=5×32
=128=72=160
⑹、运用乘法分配律的减法进行简算。
12×5.9-5.9×24.6×2.5-2.5×0.6101×9.7-9.7
=(12-2) ×5.9=(4.6-0.6)×2.5=(101-1)×9.7
=(12-2) ×5.9=(4.6-0.6)×2.5=(101-1)×9.7
=10×5.9=4×2.5=100×9.7
=59=10=970
⑺、运用减法的运算规律进行简便计算。
1.8-0.45-0.5554.4-4.6-5.435.6-0.13-0.47
=1.8-(0.45+0.55)=54.4-(4.6+5.4)=35.6-(0.13+0.47)
=1.8-1=54.4-10=35.6-0.6
=0.8=44.4=35
⑻、运用除法的运算规律进行简便计算。
4.5÷4÷7.514.8÷1.25÷818.5÷4÷1.255.4÷4÷0.45
=4.5÷(4×7.5)=14.8÷(1.25×8)=18.5÷(4×1.25)=5.4÷(4×0.45)
=4.5÷30=14.8÷10=18.5÷5=5.4÷0.18
=0.15=1.48=3.7=30
⑼综合运用各种运算定律进行简算。
2.54+2.46+0.44+0.5410.7×0.4-6.7×0.40.5×3.2×1.25
=(2.54+2.46)+(0.44+0.54)=(10.7-6.7)×0.4=(0.5×4)×(0.8×1.25)
=5+1=4×0.4=2×1
=6=1.6=2
89.7+5.8-9.7+4.299×0.38+0.38360÷(18×0.4)
=(89.7-9.7)+(5.8+4.2)=(99+1) ×0.38=360÷18÷0.4
=80+10=100×0.38=20÷0. 4
=90=38=50
4.8×12.52.5×1.6×12.53.2×102
=0.6×(8×12.5)=(2.5×0.2)×(8×12.5)=3.2×(100+2)
=0.6×100=0.5×100=3.2×100+3.2×2
=60=50=320+6.4
=326.4