已知实数x,y满足x²+(√2)y=√3,y²+(√2)x=√3,且x≠y,求x+y和xy的值.
已知实数x,y满足x²+(√2)y=√3,y²+(√2)x=√3,且x≠y,求x+y和xy的值.
已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
已知x、y是实数,且适合方程(x²+xy-12)²+(xy-2y-1)² =0,求x、y的
已知x,y满足x²-4xy+4y²-5(x-2y)=3,求2x-4y值
已知实数x,y满足x²+4y²=4.求f(x,y)=x²+2xy+4y²+x+2
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知x+y=-3 求(2x²+xy+3y²)-(x²-xy+2y²)的值
已知x+y=-3,求(2x²+xy+3y²)-(x²-xy+2y²)的值.
已知x/y=2,求(x²-xy+3y²)/(x²+xy+6y²)的值
已知y分之x=2,求(x²+xy+6y²)分之(x²-xy+3y²)的值