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计算：(x^3-3x^2)/(x^2+5x+6)÷(x^3-9x)/(x^2+2x-3)*(x+2)/(2x)
化简：[(x+2)/(x^2-4)-(2x-5)/(x-4x+4)]÷[(x-3)/(x-2)]
(（x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
(x^2)^5÷(X^2)^2
(5x+14)÷(x+2)=?
【【【急】】】分式计算x^2-x-6/x-3 ÷ x-3/x^2-5x+6
x²-2x-3分之16-x²÷x-3分之x²-5x+4
先化简再求值 x/(x+2)-(x²+2x)/(x-5)÷[(x²-1)/(x-1)] 其中x=根号
通分x+4/x*x+4x与x-5/x(x-5)-2(x-5)
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
35(x-2)-15(5x-6)=(22x-63)-21(3x-4)咋算?