15/16+（8/9-2/3）*1/2
=15/16+4/9-1/3
=15/16+4/9-3/9
=15/16+1/9
=(135+16)/144
=151/144
720/12/5
=720×5/12
=60×5
=300
4.89*6.3+48.9×0.37
=4.89×(6.3+3.7)
=4.89×10
=78.9
7.6*1.01
=7.6×(1+0.01)
=7.6+0.076
=7.676