脱式计算:(能简算的要简算) 128+306÷17×9 25×33×4×2 &...
脱式计算:(能简算的要简算)128+306÷17×925×33×4×2156+6.2-15.6+6.270-29.6-10.4132×75-75×32283×15+17×...
脱式计算:(能简算的要简算) 128+306÷17×9 25×33×4×2 156+6.2-15.6+6.2 70-29.6-10.4 132×75-75×32 283×15+17×15.
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(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.
=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.
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