Question

4.1x6.8+42x4.7一4.7怎么简便计算

Answer 1

4.1x6.8+42x4.7一4.7怎么简便计算

4.1×6.8+42×4.7-4.7
=4.1×6.8+（42-1）×4.7
=4.1×6.8+41×4.7
=41×6.8÷10+41×4.7
=41×0.68+41×4.7
=41×（0.68+4.7）
=41×5.38
=220.58

简便计算3.2x4.7一7.8

3.2×4.7-7.8
=3.2×(5-0.3)-7.8
=16-0.96-7.8
=16-(0.96+7.8)
=16-8.76
=16-10+1.24
=6+1.24
=7.24

85.6x42+856x6.8-856的简便计算

85.6x42+856x6.8-856
=856x4.2+856x6.8-856
=856x（4.2+6.8-1）
=856x10
=8560

165x42-42x65(简便计算

乘法结合律
=42*（165-65）=4200

5.9x4.7＋4.7x4.1x4.7 用最简便的方法计算 求过程？

＝4·7x（5·9＋4·1＋1）
＝4．7x11
＝51·7

10.3x4.7的简便计算

（10+0.3）x4.7
=10x4.7+0.3x4.7
=47+1.41
=48.41

4.6x13.7-4.7x4.7+4.6x11用简便计算

4.6x13.7-4.6x4.7+4.6x11
=4.6x(13.7+11-4.7)
=4.6x20
=92

简便计算64x4.7十31.2x16

简便计算
64x4.7十31.2x16
=64×4.7+7.8×64
=64×（4.7+7.8）
=64×12.5
=8×（8×12.5）
=8×100
=800

用简便计演算法106X42一42x6

用简便计演算法
106X42一42x6
=42×(106-6)
=42×100
=4200

7.5x4.7 5.9x2.5要怎么简便计算

7.5x4.7+5.9x2.5
=2.5x3x4.7+5.9x2.5
=2.5x14.1+5.9x2.5
=2.5x(14.1+5.9)
=2.5x20
=50