19/7*14/9+19/5*2/1
=19*2/9+19/5*2
=38/9+38/5
=38(1/9+1/5)
=38(5+9)/45
=38*14/45
=532/45
12/11*16/13+12/13*16/11
=(12*16+12*16)/11*13
=2*192/143
=384/143