化简(2x-3y)²-(2x-3y)·(2x3y)+y(6y+5x)
计算(1)(x+2y-3)(x-2y+3); (2)(2x3y)2•(-2xy)+(-2x3y)
已知实数x y满足条件|2x-3y+1|+(x3y+5)的二次方=0求式子(-2x*y)的二次方(-y的二次方)×6xy
已知x+y=5,xy=3,求代数式x3y-2x平方y平方+xy3
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(3x-y)²-2x(4x-5y)-(x+2y)²
研究下列二元一次方程组的解的情况2X+3Y=6,2X-3Y=6.2X+3Y=6,2X+3Y=8.2X3Y=6,4X+6y
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
-(5x+y)-3(2x-3y)(化简)