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[x+2+(5)/(2-x)]*(2x-4)/(3-x)
人气:494 ℃ 时间:2020-02-06 10:05:48
解答
=[(x+2)(x-2)/(x-2) -5/(x-2)]×[-2(x-2)/(x-3)]
=(x²-4-5)/(x-2)×[-2(x-2)]/(x-3)
=(x+3)(x-3)/(x-2) ×[-2(x-2)]/(x-3)
=-2(x+3)
=-2x-6
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