1.若(x-2)²+丨y+5丨=0,求-2x³-y²的值
1.若(x-2)²+丨y+5丨=0,求-2x³-y²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.
1.若x²+y²-4x+2y+5=0,求x,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
丨3x+2y+3丨+(2x-4y-14)²=0,求x y的值.
丨x+2y+3丨+(2x+y)²=0,求x-y的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若x²-4x+y²+2y+5=0,求x、y的值.
若(3x-y+5)²+√2x-y+3=0,求x-y的值
若X-2Y+6+(X+Y+12)²=0,求4X+ 5Y的值
已知x² +y²+5/4=2x+y,求y-x的值
已知x+3y=0,求x³+3x²y-2x-6y的值.