7/10÷1/99+7/10=?简便算法 1/2÷(11/12-5/9)简便算法 快要看点

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7/10÷1/99+7/10=?简便算法 1/2÷(11/12-5/9)简便算法 快要看点

7/10÷1/99+7/10=?简便算法 1/2÷(11/12-5/9)简便算法 快要看点
7/10÷1/99+7/10=?简便算法 1/2÷(11/12-5/9)简便算法 快
要看点

7/10÷1/99+7/10=?简便算法 1/2÷(11/12-5/9)简便算法 快要看点
7/10÷1/99+7/10
=(7/10)*(99+1)
=7*10
=70;
1/2÷(11/12-5/9)
=1/2/(33/36-20/36)
=1/2/(13/36)
=18/13

= 7/10 * 99 +7/10
= 7/10 * (99+1)
=7/10 * 100
=70

7/10÷1/99+7/10
=7/10*99+7/10
=7/10*(99+1)
=7/10*100
=7*10
=70

原式=7/10*99+7/10=7/10*(99+1)=70