脱式计算一般小学四年级就开始用了,它用在加减乘除四则运算法上,这样可以看清每步是怎么计算的,(12+13)×40÷20-5
=25×40÷20-5
=1000÷20-5
=50-5
=10
脱式计算一般小学四年级就开始用了,它用在加减乘除四则运算法上,这样可以看清每步是怎么计算的,(12+13)×40÷20-5
=25×40÷20-5
=1000÷20-5
=50-5
=10
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