已知x^2+2y^2+2xy-8y+16=0,求y^x的值

已知x-xy=8,xy-y=-9,求x+y-2xy的值 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知实数xy满足x+2y 已知实数xy满足 x+y-2 已知正数x,y满足2x+8y-xy=0,x+y的最小值 已知(x+y)^2=16,(x-y)^2=8,那么xy的值是 已知x+y=1,xy=-2,则x²y+xy²-2xy 已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值 已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=? 已知x+y=1,xy=3/16,求x³y-2x²y²+xy³ 已知x,y为正整数,并且xy+x+y=71,x^2y+xy^2=880,求3x²+8xy+3y² 已知x+y=-10,xy=16求x²+y²,(x-y)²,(x+2)(y+2),x²-xy+y².求值！ 已知x^2+xy=16 y^2+xy=9 求(x+y) (x-y)分别是 x+y x-y 不是乘 已知xy=-8,xy(x+y)=-16,求x∧2+y∧的值. 已知x的平方+y的平方-2xy-8x+8y+16=0,则x-y等于 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知|x-y+1|与x^+8x+16互为相反数,求x^+2xy+y^的值.x^2+2xy+y^2