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数学
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1/5X+(1/5X-20)+500=X
解方程,算出X
人气:129 ℃ 时间:2020-02-06 08:37:16
解答
1/5X+(1/5X-20)+500=X 2/5 * x + 480 = x 480 = x - 2/5 * x 480 = 3/5 * x x = 480 * 5/3 = 800
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