已知|x+y-2|+(2x-3y+6)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
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知|x+y-2|+(2x-3y+6)²=0,求x,y的值.
已知x+3y=0,求x³+3x²y-2x-6y的值.
已知x-y/x=x/x-2y(y不等于0),求x:y的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+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x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值