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(-1/63)÷(1/9-2/7+2/3-1/14) 要简便方法急求!
人气:180 ℃ 时间:2020-05-08 06:12:08
解答
(-1/63)÷(1/9-2/7+2/3-1/14)
=(-1/63)/(7/9-5/14)
=(-1/63)/(98-45)/126
=(-1/63)*126/54
=-1/27
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