化简:a-2a+3a-4a+5a-6a+.+2010a+2011a.
问题描述:
化简:a-2a+3a-4a+5a-6a+.+2010a+2011a.
答
a-2a+3a-4a+5a-6a+.......+2010a+2011a
=a(-1-1-1-1....-1)+2011a
=-1005a+2011a
=1006a
答
(a-2a)+(3a-4a)+……+(2009a-2010a)+2011a=-1005a+2011a=1006a