xy-2x+6y-12 xy+8
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^2-xy-6y^2+3xy+y+2
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
(xy-x^2)乘以(xy)/(x-y)
已知x-xy=8,xy-y=-9,求x+y-2xy的值
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
已知A=8x^2y-6xy^2-3xy,B=7xy^2-2xy+5x^2y,
(1)1-a/a*a-2a+1 (2)3x-4y/8xy-6x*x (3)2x*xy(x-y)/12xy*y(y-x)
麻烦你们团队了:计算:1、(6xy^2-12x^3y^4+2x^2y^2)/(-2xy^2) 2、8(x-y)^4(x+
因式分解:3x^2y+6xy-4x-8
因式分解 3x^2-6xy-4x+8y
已知x+y=6 xy=8求x+2xy+y分之2x-xy+2y的值