题目内容
a-b-c+d=a-c+( )
(1) =________;
(2) =________;
(3) =________;
(4) =________;
(5) =________;
(6) =________.
关于x的多项式是二次三项式,则a=________,m=________;当x=-2时,该二次三项式的值为________.
计算:3abc+5cba-abc= .
如果a+b=1,则5-a-b= .
若a、b互为相反数,m、n互为倒数,则a-(mn-b)=________.
________.
=________.
计算
= .