10x+y=143 10y+x=341 求x,y
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
第一道:已知X的平方+Y的平方-4X+10Y+29=0.求分式X+Y/X-Y+X-Y/X+Y的值.
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
y=ln(1+x),求y^10(x)?
求y'=y/(y-x)
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
(x+y)(x+y+10)+25=0 x-y=3.求x,y的值
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知x^2+y^2--6x--2y+10=0,求x+y/x--y
已知x^2-2x+y^2+6y+10=0,求分式x-y/x+y的值
若x^2+y^2-8x-10y+41=0,求x/y+y/x的值