6.1×3.6+3.8x3.9的简便运算？
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6.1×3.6+3.8x3.9
=6.1×（3.8-0.2）+3.8x3.9
=6.1×3.8 - 6.1×0.2 +3.8x3.9
=6.1 x 3.8 +3.8x3.9 - 6.1×0.2
=3.8 x (6.1+3.9 ) - 1.22
=3.8 x 10- 1.22
=38- 1.22
=36.78
=6.1×（3.8-0.2）+3.8x3.9
=6.1×3.8 - 6.1×0.2 +3.8x3.9
=6.1 x 3.8 +3.8x3.9 - 6.1×0.2
=3.8 x (6.1+3.9 ) - 1.22
=3.8 x 10- 1.22
=38- 1.22
=36.78
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展开全部
6.1*3.6+（3.6+0.2）*3.9
=6.1*3.6+3.6*3.9+0.2*3.9 乘法分配律简便
=3.6*（6.1+3.9）+ 0.2*3.9
=3.6*10+0.78
=36.78
=6.1*3.6+3.6*3.9+0.2*3.9 乘法分配律简便
=3.6*（6.1+3.9）+ 0.2*3.9
=3.6*10+0.78
=36.78
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