x+2y=1/3 x-5y=-1/2 求6x^2-18xy-60y^2
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知:x+2y=1,x-5y=-1,求6x²-18xy-60y² ---------------
1/x-1/y=3,求2x+3xy-2y/x-y
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值
已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(xy+y)的值
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x+1/y=3,求(3x-5xy+3y)/(x-2xy+y)