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(5/12-1/19)*12 -7/19後邊是7/19吧 =5/12*12-1/19*12 -7/19這一步是用乘法分配律 =5- 12/19 -7/19 =5-(12/19+7/19)連减可以等於减去它們的和 =5-1 =4
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