(2x-3y)(2x+3y)(4x²+9y²)怎么做?
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?
(3x-y)²-2x(4x-5y)-(x+2y)²
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
(x-2y)²+(2x-4y)(x+y)+(x+y)²
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
该怎么画出y=2(x+2)²+1,y=- 3/4(x-3)²+2.y=x²-x-2,y=-
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.