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2014-08-09T13:29:49+03:00
A)(5a+3-3a+1)/(3a+6)= (2a+4)/(3a+6)=  2(a+2)/3(a+2)= 2/3

b)(2014+2013+2012+....+3+2+1)/2014=  (2014+1) *2014/2/2014=

=2015*1007/2014=

=2015 *1/2=

=2015/2 =1007,2