(5/12-1/19)*12 -7/19 后边是7/19吧
=5/12*12-1/19*12 -7/19 这一步是用乘法分配律
=5- 12/19 -7/19
=5-(12/19+7/19) 连减可以等于减去它们的和
=5-1
=4
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