简便计算:7.292-2.712= . | |
(2008•宁波)分解因式:2x2-12x+18= . | |
(2009•厦门质检)x2+4x+4=( )2. | |
分解因式:6a3-54a= . | |
(2009•内江)分解因式:-x3-2x2-x= . | |
简便计算:20082-2009×2008= . | |
若x2+ax+b=(x+3)(x-4),则a= ,b= . | |
(2013•黄石)分解因式:3x2-27= . | |
(2006•温州)若x-y=3,则2x-2y= . | |
(2011•鼎湖区模拟)下列各式从左到右的变形中,是因式分解的为( ) A.x(a-b)=ax-b B.x2-1+y2=(x-1)(x+1)+y2 C.x2-1=(x+1)(x-1) D.ax+bx+c=x(a+b)+c |
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