已知丨x丨=6,丨y丨=2,且丨x+y丨=-(x+y),求xy值
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
已知丨x丨=3 丨y丨=2且xy<0 则y分之x的值等于( )求过程我想知道
已知丨x-1丨+(y+2)²=0,求代数式x²-xy+y²的值
已知|x|=6,|y|=2,且|x+y|=﹣(x+y),求xy值.
已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知3(x-1/2)^2+4丨y+1丨=0,求3x^2y^2+2xy-7x^2y^2-3/2xy+4x^2y^2的值
已知丨x-1丨+丨y-3丨=0 求x+y分之xy的值
已知xy满足丨x+y-4a-5丨(x-y-6a+5)²=0,q且4x+5y<9,求a的取值范围
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.