已知x,y满足 |x+2|+(x+3y+5)²=0.求(-2xy)²(-y)²·6xy
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x,y满足x²+y²+5/4=2x+y,求代数式xy/(x+y)的值.
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知x、y的方程组3(x²+y²)-5xy=6,2(x²+y²)+xy=17,求
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知,x-y=5,xy=6,求(x+y)²-2x-2y+1的值
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知xy都是正实数且满足4x²+4xy+y²+2x+y-6=0则x(1-y)的最小值
已知有理数x,y满足xy=4,x+y=7,则x²y+xy²=()?