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1/x-1/9x-20=1怎么解
人气：213 ℃　时间：2020-04-13 00:47:19
解答
9/9x - 1/9x -20 = 1
8/9x - 20 =1
8/9x = 1 + 20
8/9x = 21
8 = 9x * 21
8 = 189x
x = 8 / 189
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