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80/x=2.5×80/(x+2.5)如何解
人气:249 ℃ 时间:2020-05-28 19:36:29
解答
80/x=2.5×80/(x+2.5)
1/x=2.5/(x+2.5)
2.5x=x+2.5
1.5x=2.5
x=5/3
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