6x²-xy-y²-x-7y-12
x²/xy-x/y
计算:(xy-x²)×x-y/xy
[-xy/(x-y)²]²×(y²-xy/x)³
x/xy-y²与y/x²-xy 通分
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
x²+xy-6y²因式分解
因式分解x²+xy-6y²
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
[(X²-7XY+10Y²)/(X²+4XY-12Y²)]×[(X²+
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)