7(x-1)2+4(x-1)(y+2)-20(y+2)2 xy2-2xy-3x-y2-2y-1 4x2-6ax+18a2
因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2
若x2y+xy2=30,xy=6,求下列代数式的值:(1)x2+y2;(2)x-y.
x2-(a+b)xy+aby2 x2+4xy-5y2 x2-5x+3 2x2+xy-y2-4x+5y-6
由X2-2XY+Y2-X+Y-1=0得到X-Y的值为.
化简x2+2x+1分之x2-y2÷x+1分之x-y
因式分解方法x2-xy+2x-y-3是x方-xy+2x-y-3,
若实数xy满足x2十y2-2x+4y=0,则x-2y的最大值为多少?
2x2+xy-3y2+x+4y-1因式分解
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
已知代数式(4x2+ax-y+6) -(2BX2-2X+5Y-1)的值与字母x的取值无关,求代数式3(a2-2ab-b2
已知x2+y2+2x-6y+10=0,求xy的值
已知对任意有理数X.Y,等式(x+y)2=X2+2XY+Y2都恒成立,那么当x-2y+z=1,X2+Y2-Z2=-2时,