已知:(x+2)²+|x+y-10|=0,求3x²y-[5x²y-﹙2xy-x²
已知:(x+2)²+|x+y-10|=0,求3x²y-[5x²y-﹙2xy-x²
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值