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简介:
一、乘法分配律
(1.25-0.125)×8
=1.25×8-0.125×8
=10-1
=9(正用)
(125+2.5)×0.8
=125×0.8+2.5×0.8
=1+1
=2(正用)
二、把其中一个因数分成两个数的和或差,再按乘法分配律
3.65×10.1
=3.65×(10+0.1)
=3.65×10+3.65×0.1
=36.5+0.365
=36.865
0.32×403
=0.32×(400+3)
=0.32×400+0.32×3
=128+0.96
=128.96