若|2x+y-3|+(x-1/2y)^2=0,求4x^2-2y-y^2-1的值
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求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?
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
已知3x-4y/2x+y=1/2 求x/y的值
已知|2x-3y|+|3x-y-1|=0,求x,y的值.
已知4x=9y求(1)x+y/y (2)y-x/2x
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知:x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值.