(2x-3y)(2x+3y)(4x²+9y²)求过程
(2x-3y)(2x+3y)(4x²+9y²)求过程
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)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
求过程【(x+2y)(x-2y)+4(x-y)²】÷6x (2x-3)(3x-2)-x(6x-1)+12(x-
(3x-y)²-2x(4x-5y)-(x+2y)²
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²