216＋64×42÷28
=216+16×4×7×6÷4÷7
=216+16×6
=312
87×26-26×37
=26×（87-37）
=26×50
=1300
4700÷25÷4
=4700÷（25×4）
=4700÷100
=47
8.29＋3.7＋0.71＋6.3
=8.29+0.71+3.7+6.3
=9+10
=19
125×32×25
=125×8×4×25
=1000×100
=100000
9-1.45+3.75
=9-1+3-0.45+0.75
=12.3谢喽！！！不客气