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求助

y等于1-x除以1-x

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1楼2023-04-07 15:20回复
    y = (1-x)/(x-1) = [(-x+1)]/(x-1) = [-(x-1)]/(x-1) = -[(x-1)/(x-1)] = -1


    IP属地:江苏2楼2023-04-07 21:22
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