[(x+1/4y)²-(x-1/4)²]·(3x-1/3y)(3/1y+3x)(1/9y²
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
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&
[(x+1/4y)²-(x-1/4)²]·(3x-1/3y)(3/1y+3x)(1/9y²
[(x+1/4y)²-(x-1/4y)²]·(3x-1/3y)(1/3+3x)(1/9y²
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
(1):(x+2y)²-(x+y)(3x-y) (2):(2x+3y)²-(2x-3y)²
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
(x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)