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-1/42÷(1/6+2/3-2/7-3/14)=
人气:119 ℃ 时间:2019-09-22 10:06:48
解答
-1/42÷(1/6+2/3-2/7-3/14)
=-1÷(42×1/6+42×2/3-42×2/7-42×3/14)
=-1÷(7+28-12-9)
=-1÷14
=-1/14
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