已知|x+y+3|+(x-y-1)²=0,求1/2{【(-x^﹣²)y】²}^﹣3
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知实数x,y满足根号(x+3y-1)+y²+2y+1=0,求2x-y的平方根
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x²-4x-1=0,求代数式(2x-3)²-(x+y)(x-y)-y²的值
已知x²-4x-1=0求代数式(2x-3)²-(x+y)(x-y)-y²的值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值