已知2x+3y=-8 4x+y=66 则（x-y)^2-(3x+2y)^2的值为______

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2x+3y=-8 4x+y=66 则（x-y)^2-(3x+2y)^2的值为______ 已知3x-4y=0,则x^2-y^2/x^2+y^2 已知|5x-y-8|+(7y-x+2)=0则4x+6y 已知x-2y=2,求4x-y-8分之3x+y-6 已知-x+y=3,则2(x-y)2次方-4(x-y)+6 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知2x+2y=-8,4x+y=15求（x-y)^-(3x+2y)^ 已知2x=3y,则y分之x=< >,y分之x+y=< >. 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^4的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=? 已知3x=8y,则x;y=? 已知2x+3y=1,则4^x+8^y最小值为?此时x+y=? 已知|x+y-3|+(x-y)2=0则