(x²-2x)分之(x+2)-(x²-4x+4)分之(x+1) 计算
问题描述:
(x²-2x)分之(x+2)-(x²-4x+4)分之(x+1) 计算
答
(x²-2x)分之(x+2)-(x²-4x+4)分之(x+1)
=(x+2)/x(x-2)-(x+1)/(x-2)²
=(x-2)(x+2)/x(x-2)²-x(x+1)/x(x-2)²
=[x²-4-x²-x]/x(x-2)²
=-(x+4)/x(x-2)²(x²-2x)分之(x+2)-(x²-4x+4)分之(x-1)刚才题打错啦 麻烦从新来(x²-2x)分之(x+2)-(x²-4x+4)分之(x-1) =(x+2)/x(x-2)-(x-1)/(x-2)² =(x-2)(x+2)/x(x-2)²-x(x-1)/x(x-2)² =[x²-4-x²+x]/x(x-2)² =(x-4)/x(x-2)²