标题要长.(9x^4/16y^2)*(2y)/(3x) )
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
因式分解-x^3+2x^2y-xy^2和16(x-y)^2-9(x+y)^2和(x+2)(x+4)+x^2-4
(3x-2y)×(3x+2y)×(9x+4y)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
(3x-y)²-2x(4x-5y)-(x+2y)²
(1){x+2y=0,3x+4y=6(2){5x+6y=16,7x-9y=5(3){9x-11y+1=0,4x-5y-3
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
化简求值:【(4X-3y/2)(4X+3y/2)4XY-Y/4(16X-9Y)】*8X
(x-y)(x-2y)-(3x-2y)(x-3y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²