5/7*33*1/5/11
=(5/7)*(1/5)*(33/11)
=(1/7)*3
=3/7
2013*3.25+6.75*2013
=2013*(3.25+6.75)
=2013*10
=20130
2.5*32*1.25
=2.5*4*8*1.25
=(2.5*4)*(8*1.25)
=10*10
=100