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括号2/3-5/6-7/8+1/12括号乘以-24

解法如图。

括号5/6+7/8+1/12括起来乘以24简算 解:采用分配律, 原式=(5/6+7/8+1/12)x24 =5/6x24+7/8x24+1/12x24 =20+21+2 =41+2 =43

如图

99又7/8×(-4)-(1/2-1/3-5/6)x24 =-4x99又7/8-24x(3-2-5)/6 =-4x799/8+16 =-399又1/2+16 =-383又1/2

原式=-3/4×24+7/8×24+5/12×24=-18+21+10=13

-2/5+(-5/8-1/6+7/12)×24 =-2/5-5/8×24-1/6×24+7/12×24 =-2/5-15-4+14 =-5又2/5

原式=(7/8-2/8)x2 =5/8x2 =5/4

原式 =7/25+5/18+18/25 =(7/25+18/25)十5/18 =1+5/18 =1又5/18

琴歌(李颀)

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