丨2x-4丨+丨y+4丨=0求x-y 已知丨x丨=5 ,丨y丨=6 求xy的值
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知丨3x+y-5丨+丨x-2y-4丨=0 求x,y的值
已知丨x+3丨+丨y-x+4丨=0,求(x-y)(x+y)的值 越快分越多.
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x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知丨x-1丨+(y+2)²=0,求代数式x²-xy+y²的值
已知(x-3)²+丨1/4+y丨=0,求代数式7xy-5(x²+2y)-7(xy-x²)
已知丨x-1丨+丨y-3丨=0 求x+y分之xy的值
已知3(x-½)²+4丨y+1丨=0,求3x²y²+2xy-7x²y&
已知丨x+3|+|2x-y|=o求2(3x-2y)-4[3(x-y)-2(x-2y)]的值
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值