(1)128+306÷17×9
=128+18×9
=128+162
=290;
(2)25×33×4×2
=(25×4)×(33×2)
=100×66
=6600;
(3)156+6.2-15.6+6.2
=162.2-15.6+6.2
=146.6+6.2
=152.8;
(4)70-29.6-10.4
=70-(29.6+10.4)
=70-40
=30;
(5)132×75-75×32
=(132-32)×75
=100×75
=7500;
(6)283×15+17×15
=(283+17)×15
=300×15
=4500.