x^2+y^2+x+y=18x^2+xy+y^2=19越快越好!讲清楚!
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(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
(x^2+xy/x-y)/(xy/x-y)计算
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
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X-Y/2X+2Y XY/X+Y²
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(-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解
f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)!
x+y=-3 xy+x+y=-2 x/y+y/x=?
正数x,y满足x-y=2xy,求x-y/x+y的值.
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x y属于R 2^x=18^y=6^xy则x+y
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