已知|x+y+2|+(2x-3y-1)²=0 求 1.x、y的值 2.2x³-x²y-3y
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
(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=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x+3y=0,求x³+3x²y-2x-6y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+
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知|2x-3y|+|3x-y-1|=0,求x,y的值.
已知x+3y=2,求代数式(x²-y²/x+y)-【2(x+y)】的值
已知方程组{2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.