已知实数x,y满足|x+y+7|+(xy-5)^2=0,求3x^2y^3+3x^3y^2

已知实数x、y满足2x2-7xy+3y2=0,求x：y 已知实数x,y满足|x+y+7|+(xy-5)^2=0,求3x^2y^3+3x^3y^2 已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y 已知实数x,y满足5x^2-3xy+1\2y^2-2x+1\2y+1\4=0,求x,y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 已知正实数xy满足x+y=1,求1/(2x+y) +4/(2x+3y)最小值 已知x、y均为实数,且满足xy+x+y=17,x^2y+y^2x=66,求x^4+x^3y+x^2*y^2+y^3x+y 已知实数x,y满足条件|2x+3y+1|+（x+3y+5)²=0,求式子（-2xy）²×（-y
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知实数x,y满足关系式│x+y-3│+根号（xy-6）=0,求代数式（x+2y）/y-x的值 若x平方-2xy+y平方-x+y-3=0 求x-y的值 和已知实数x,y满足 x平方+xy-y平方=0求y分之x的值 怎 若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2