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数学
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(x^2-6x+9)÷x^2-9x+18/x+3
人气:289 ℃ 时间:2020-06-22 04:19:34
解答
(x^2-6x+9)÷x^2-9x+18/x+3
=(x-3)^2÷(x+3)(x-3)+18/(x+3)
=(x-3)/(x+3)+18/(x+3)
=(x+15)/(x+3)
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