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数学
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计算(1-x+2分之1)÷x²-4分之x²+2x+2
人气:412 ℃ 时间:2019-11-15 03:03:02
解答
原式=(x+2-1)/(x+2)*(x²-4)/(x²+2x+1)
=(x+1)/(x+2)*(x+2)(x-2)/(x+1)²
=(x-2)/(x+1)
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