计算:(1)x²-9/(x²+6x+9)·1/(2x-6) (2)x²-y²/(
(三分之二x√9x+6x√y/x) + ((y√x/y) -x²√1/x) 计算
约分下列分式(x-y)/(y-x)³(x²-9)/(6-2x)(x²-1)/(x-x
计算:(1)x²-9/(x²+6x+9)·1/(2x-6) (2)x²-y²/(
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
计算:(2/3x根号下9x+6x根号下y/x)+(y根号下x/y-x的平方根号下1/x)=
(三分之二x√9x +6x√x/y)+(y√y/x -x²√x/1)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
运用乘法公式计算:(1)(x-y)(x+y)-(2x-y)²
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)