若|x+y+1|+(2x-3y-2) ²=2则2x³-2²y-3y²的值
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
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,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
不解方程组{2x+Y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
不解方程2x+y=5;x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
已知方程组{2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
不解方程组{2x+y=5,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x²+x*y=-1,x*y+y²=2,试求2x²-x*y-3y²的值
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值