已知(-x+6):(x-y):(4x+y)=3:14:1,求x+y的值
已知(-x+6):(x-y):(4x+y)=3:14:1,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x=3分之1,y=二分之一,求代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+13y)的值
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
已知3X+4Y-6X-1-Y等于0.求X-Y的值
已知3x-4y/2x+y=1/2 求x/y的值
已知x-y=1,求[(x+2y)2+(2x+y)(x-4y)-3(x+y)(x-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(2x-y-1)的平方+|4x+3y-3|=0,求x,y的值