若|x-1/2|+(2y+1)²= 0,则x²+y³的值是()
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y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-1/2|+(2y+1)²= 0,则x²+y³的值是()
实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则(Y-4)/(X-2)的取值范围是?
不解方程组{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)&
方程组x+2y=1+m2x+y=3中,若未知数x、y满足x+y>0,则m的取值范围是( )
1、已知实数x、x满足x²+y²-xy+2x-y+1=0,试求x、y的值.
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知(2x-1)²+|4x-y|=0,求x+y的值