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简便计算:(x+2)(x-2)-(x-1)(x+5)
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计算:-x+(2x-2)-(3x+5)
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计算:(1)(2x/x+2)的平方×x+2/x(x-2)-(1/x-2-1/x+2)
计算:[(x²-2x+1)/(x²-1)]÷[(x-1)(x²+x)]-x
x^2-1/x^2+4x+4÷(x+1)×x^2+3x+2/x-1计算
计算3x(x^2-x-1)-2x^2(1-x)