7.2*1.3+3.8*2.8的简便运算

更新时间2021-05-17 05:11:10

7.2*1.3+3.8*2.8

=4×(2.34+2.66)

=4×5

=20

7.2×1.3+3.8×2.8

=(10-2.8)×1.3+3.8×2.8

=10×1.3-2.8×1.3+3.8×2.8

=13+2.8×(3.8-1.3)

=13+7×0.4×2.5

=13+7

=20

7.2*1.3+3.8*2.8 

=8×(0.9*1.3)+8×(1.9*0.7)

=8×(1.17+1.33) 

=8×2.5 

=20

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