1*4/17+5/9*1/17+5/18*3/17
=4/17+1/9*5/17+5/17*3/18
=4/17+5/17*(1/9+3/18)
=4/17+5/17*(5/18)
=4*18/17*18+25/17*18
=(72+25)/306
=97/306
1*4/17+5/9*1/17+5/18*3/17
=4/17+1/9*5/17+5/17*3/18
=4/17+5/17*(1/9+3/18)
=4/17+5/17*(5/18)
=4*18/17*18+25/17*18
=(72+25)/306
=97/306