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7*15分之8-7*35分之12+7*63分之16-7*99分之20怎么做
人气:270 ℃ 时间:2019-08-21 05:39:33
解答
7*8/15-7*12/35+7*16/63-7*20/99
=(56/15-12/5)+(16/9-140/99)
=(56/15-36/15)+(176/99-140/99)
=20/15+36/99
=4/3+4/11
=4*(1/3+1/11)
=4*(11/33+3/33)
=56/33
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