(-1/4X-2Y)(-1/4X+2Y)时间紧迫!= = 表示,

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(-1/4X-2Y)(-1/4X+2Y)时间紧迫!= = 表示,
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(-1/4X-2Y)(-1/4X+2Y)时间紧迫!= = 表示,
(-1/4X-2Y)(-1/4X+2Y)时间紧迫!
= = 表示,

(-1/4X-2Y)(-1/4X+2Y)时间紧迫!= = 表示,
(-1/4X-2Y)(-1/4X+2Y)
=(-1/4x)^2-(2y)^2
=1/16x^2-4y^2

(-1/4X-2Y)(-1/4X+2Y)
=(-1/4x)²-(2y)²
=1/16x²-4y²

(-1/4X-2Y)(-1/4X+2Y)
=(-1/4X)²-(2Y)²

(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)(2)(3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x (2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1) 若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是() (x²-4y²)÷(2x+y)/xy×1/x(2y-x)(2x+y)/xy 1/x(2y-x) 都是一项 把下列各式因式分解 (1)、a^2(x-y)-4a(y-x)+4(x-y) (2)、(x+y)(x-y)-(x+z)(x-z) 化简求值:【(x+Y)(X-Y)-(X-Y)的平方+2Y(2-Y)】除4Y,其中X=1 Y=2 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1 -(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y) x²y-2x²-y+2 4x(x-y)²-12(x-y)³ 因式分解-x³+x²-4分之1x 计算 x-2分之x方+1-2-x分之3-4x (x+y)x方-y方分之x方+y-x分之y方 已知:【(x²+y²)-(x-y)²+2y(x-y)】÷4y=,求4x/(4²-y²)-1/(2x+y)的值已知:【(x²+y²)-(x-y)²+2y(x-y)】÷4y=1,求4x/(4²-y²)-1/(2x+y)的值 (1)36(x+y)二次-49(x-y)二次(2)(x+y)二次/4-(x-y)二次/4 因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y 2(x+y)-(x-3y)=13,4(x+y)+3(x-3y)=1 x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)² x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 分解因式 4a(x-y)²-a²(y-x)³ (x+y+z)(x-y+z)+(y-x+z) (y-x-z)(1)4a(x-y)²-a²(y-x)³ (2)(x+y+z)(x-y+z)+(y-x+z) (y-x-z) 通分计算:(1)2x-3/(x-1)(x-4) - x-2/(1-x)(4-x) (2)x平方-y平方/xy - xy-y平方/x(y-x)还有:先化简再求值: (1)2x/x平方y平方 + x/y平方-x平方 + y/(x-y)(x+y) 其中x=4 y=-3 (2)已知(