6x²-7x-5 5x²+6xy-8y²
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
2x²-7x+3 、 6x²-7x-5、5x²+6xy-8y²、2X²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
怎样因式分解5x²+6xy-8y²-3x+8y-2
分解因式:x²+3xy+2y²+5x+7y+6
因式分解 x²+3xy+2y²+5x+7y+6
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
x²/xy-x/y
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²
求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x
(-3xy)(5x²y)+6x平方(2/7xy²-2y²)