作业帮x√x+x√y)/(xy-y2)-(x+√xy+y)/(x√x-y√y)化简希望大家帮下忙 .请把中间过程写完整......
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x√x+x√y)/(xy-y2)-(x+√xy+y)/(x√x-y√y)化简希望大家帮下忙 .请把中间过程写完整......
x√x+x√y)/(xy-y2)-(x+√xy+y)/(x√x-y√y)化简
希望大家帮下忙 .
请把中间过程写完整......
x√x+x√y)/(xy-y2)-(x+√xy+y)/(x√x-y√y)化简希望大家帮下忙 .请把中间过程写完整......
令x^1/2=z,y^1/2=w,
原式=(z^3+z^2w)/(z^2w^2-w^4)-(z^2+zw+w^2）/(z^3-w^3)
=(z^3+z^2w-w^3-w^2z)/(z^2w^2-w^4)
=[(z^3-w^3)+(z^2w-w^2z)]/(z^2w^2-w^4)
=(z^2+2zw+w^2)(z-w)/w^2(z-w)(z+w)
=(z+w)/w^2
=(√x+√y)/y
(x-y)(x2+xy+y2)
(x+y)(x2-xy+y2)
(x-y)(x2+xy+y2)-xy(y-x)
分式计算题：(x√x+x√y)/(xy-y2)-(+√xy+y）/(x√x-y√y)求解
因式分解x2+y2-xy-x-y+1
x2-4y2-3xy+y+x
x>0.y>0.z>0.求证√x2+xy+y2+√y2+yz+z2>x+y+z
(x+√(x2+2011))(y+(√y2+2011))=2011,x2-3xy-4y2-6x-6y+58
y厂x+x厂y/xy-y2-x+厂xy+y/x厂x-y厂y 化简
因式分解x^3y-2x^2y2+xy^3
已知x.y满足X2-y2=2xy.则x-y/x+y=?x.
1.已知正数x,y满足x2-y2=2xy,求(x-y)/(x+y)的值2.若x2+xy-2y2=0则(x2+3xy-2y2)/x2-2y2)=_________3.先化简,后求值：(3-x)/(x-2)除以（x+2-2/(x-2)）,其中x=2√2
计算：｛x√x+x√y / xy-y²}-{x+√xy+y / x√x-y√y}
x2+y2 xy+x+y-1x y属于R 比较大小 x2+y2 xy+x+y-1
x√x+x√y)/(xy-y2)-(x+√xy+y)/(x√x-y√y)化简希望大家帮下忙 .请把中间过程写完整......
已知f(x,y)=x2+y2,求f(x-y,√xy)第二题是：f(x-y,√xy)=x2+y2,求f(x,y)最好告诉下我为什么这么设.
x2+x+y2/x+y
(4x-2y-1)^2+√xy-2=0,求4x^2y-4x^2y2+xy^2的值