因式分解速度！！

显示全部楼层 · 2007-11-4 11:18:03

X^4-X^2-72=(X^2+8)(X^2-9)=(X^2+8)(X+3)(X-3)(X+2)(X+3)+3X+1=X^2+5X+6+3X+1=X^2+8X+7=(X+7)(X+1)

千问 · 2007-11-4 11:18:03

X^4-X^2-72=(X^2+8)(X^2-9)=(X^2+8)(X+3)(X-3) (X+2)(X+3)+3X+1=X^2+5X+6+3X+1 =X^2+8X+7 =(X+7)(X+1)X^4-X^2-72=(X^2+8)(X^2-9) =(X^2+8)(X+3)(X-3) (X+2)(X+3)+3X+1 =X^2+5X+6+3X+1 =X^2+8X+7 =(X+7)(X+1)