14.2.2 乘法公式(二)练习题1.填空:(1)平方差公式(a+b)(a-b)= ;(2)完全平方公式(a+b) 2= ,(a-b) 2= .2.运用公式计算:X(1) (2x-3)2 (2) (-2x+3y)(-2x-3y)= = = (3) (12m-3)( m+3) (4) (13x+6y)2= = = 3.判断正误:对的画“” ,错的画“”.(1)(a+b)2=a2+b2; ( ) (2)(a-b) 2=a2-b2; ( )(3)(a+b)2=(-a-b)2; ( )(4)(a-b) 2=(b-a)2. ( )4.去括号:(1)(a+b)-c= (2)-(a-b)+c=(3)a+(b-c)= (4)a-(b+c)=5.填空:(1)a+b+c=( )+c; (2)a-b+c=( )+c;(3)-a+b-c=-( )-c; (4)-a-b+c=-( )+c;(5)a+b-c=a+( ) (6)a-b+c=a-( );(7)a-b-c=a-( ); (8)a+b+c=a-( ).6.运用乘法公式计算:新课 标第 一网(1) (a+2b-1)2 (2) (2x+y+z)(2x-y-z)= = = = =