4X2+4xy-3y2+2x+11y-6因式分解

计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2） x2-4y2-3xy+y+x x2-2xy+y2=4 x2+y2-x-y=6 解不等式x2-2xy+y2=4 x2+y2-x-y=6 解不等式 已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2= 4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy 2x2+xy-y2-4x+5y-6 因式分解 2x2+xy-3y2+x+4y-1因式分解 4X2+4xy-3y2+2x+11y-6因式分解 因式分解 a3b-ab3+a2+b2+1 3x2-11xy+6y2-xz-4yz-2z2 x2-8xy+15y2+2x-4y-3 因式分解 2x2+xy-y2-4x+5y-6 x2-y2+a2-b2+2ax+2by 3x2+5xy-2y2+x+9y-4 b4-2b2-82x2+xy-y2-4x+5y-6x2-y2+a2-b2+2ax+2by3x2+5xy-2y2+x+9y-4b4-2b2-8 x3-y3-x2+2xy-y2 因式分解还有：(2) x2+2xy-3y2+3x+y+2(3) 6x2-7x-4（实数范围内） 解方程组 ｛3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方 还有{2x-3y=12x2-3xy+y2-4x+3y-3=0 (x+√(x2+2011))(y+(√y2+2011))=2011,x2-3xy-4y2-6x-6y+58 X2+Y2+8X+6Y+25=0 求代数式(x2-4y2/x2+4xy+4y2)-x/x+2y 已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值 因式分解：3x2+5xy-2y2+x+9y-4 x2+x-(a2-a) 3x2+4xy-y2 x,y,a后面的2表示平方 xy-1+x-y 十字相乘法因式分解怎么做啊xy-1+x-y x2y-3xy-2x+6 3x2+4xy+y2 已知x2-3xy-4y2的绝对值+2倍根号x2+4xy+4y2-1=0 求3x+6y的值