化简:(X2+XY+Y2)2 — 4XY(X2+Y2)
(2x2-3xy+4y2)+(x2+2xy-3y2)化简(要有过程)
在x2+2xy-y2,-x2-y2+2xy,x2+xy+y2,4x2+1+4x中,能用完全平方公式分解因式的有( )个
如果M=3x2-2xy-4y2,N=4x2+5xy-y2,则8x2-13xy-15y2等于( )
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2的值为( )
已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值
因式分解:x3+(y-1)x2-2xy-y2
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知:A=4x2-4xy+y2,B=x2+xy-5y2,求(3A-2B)-(2A+B)的值.
已知x2-xy=-3,2xy-y2=-8,求2x2+4xy-3y2的值.
已知x2-xy=7,2xy+y2=4,则代数式x2+xy+y2的值是___.
1,1,X2-1-2xy+y2