化简(1+y/x)/(1-y/x)
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化简(1+y/x)/(1-y/x)化简(1+y/x)/(1-y/x)化简(1+y/x)/(1-y/x)分子分母同乘以x=(x+y)/(x-y)[(x+y)/x]/[(x-y)/x]=[(x+y)/x]
化简(1+y/x)/(1-y/x)
化简(1+y/x)/(1-y/x)
化简(1+y/x)/(1-y/x)
分子分母同乘以x
=(x+y)/(x-y)
[(x+y)/x]/[(x-y)/x]=[(x+y)/x][x/(x-y)=(x+y)/(x-y)
(x+y)/(x-y)
化简1/2x-1/x+y(x+y/2x-x-y)
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
化简(1+y/x)/(1-y/x)
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3
化简|1-x+y|-|x-y|(x<0,y>0)=________?
计算: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)
化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2;
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
化简,求值2(x-2y)+(2y-x)-4(x-2y)-3(2y-x)其中x=-1,y=二分之一
对于(y一撇)y`=y/x(y-1)求导,我求的结果是y``=-y^2-y`x+y/x^2(y-1)^2 怎么不对啊,我的求导过程是:y`x(y-1) - [x(y-1)]` y y`xy-y`x-(y-1+xy`)y -y^2-y`x+yy``=-------------------------=----------------------=-----------------x^2 (y-1
2(x+y)-3分之2(x-y)-3(x+y)+3分之2(x-y)化简 其中x=-2,y=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
化简:(1/(x-y)—1/(x+y))除以2y/(x^2-2xy+y^2)
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;