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数学
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42/(X+18)=(18*4-42)/X
求求 急
人气：247 ℃ 时间：2020-03-29 18:33:53
解答
42/(X+18)=(18×4-42)/X 42/(X+18)=30/X 去分母得42X=30(X+18) 移项化简得12X=540 解得X=45
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