化简:((a-1)/(a-2))/((a²-2a+1)/(2a-4))
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[a/(a-1)+a/(a+2)](a+2)/(2a平方+3a+1)化简
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化简2a(a-1/2)+a
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大家帮忙解方程 化简a(a-1)(a+2)-(a+2)a(a-1)(a+2)-(a+2)化简
(a 1)(a 2)(a 3)(a
(a+2)(a+1)-a(a-3)