(x^-1)+(y^-1)/1-(x^-1)(y^-1) 明天就要交,十万火急,
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3(x-1)³y-(1-x)³z m(x-y)²-x+y x²(x+y)(y-x)-xy(x+y)(x-y) 因式分解
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
化简1/2x-1/x+y(x+y/2x-x-y)
计算2x/1-x+y/1·(2x/x+y-x-y)
1/2x-(x+y/2x -x-y)÷(x+y)
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
y=2x*(*代表X)y=(lnx)*y=(x/1+X)*
(x +y)的平方-4(x+ (x +y)的平方-4(x+ y-1)~(因式分解)
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
(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
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
【(x-y)的平方+(x-y)(x+y)】除以x,其中x= -1 y=二分之一
若√x-1-√1-x=(x+y)²先化简再求值:(1/2x)-(1/x+y)[x²-y²+(x+y/2x]
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
先化简,再求值 (1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009 (2)y(x+y)+(x+y)(x-y)-x的平方,先化简,再求值(1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009(2)y(x+y)+(x+y)(x-y)-x的平方,其中x=-2,y=二分
(x²-4y²)÷(2x+y)/xy×1/x(2y-x)(2x+y)/xy 1/x(2y-x) 都是一项