3.7×1.5 17.68怎么用简便法计算?
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(1)2.7+7.3×1.5
=2.7+10.95
=13.65
(2)2.5×0.32×12.5
=(2.5×4)×(0.8×12.5)
=10×10
=100
(3)17.68÷5.2+2.7×1.5
=3.4+4.05
=7.45
(4)3.66×0.8+0.34×0.8-0.8
=(3.66+0.34-1)×0.8
=3×0.8
=2.4
(5)35.6-5×1.73
=35.6-8.65
=26.95
(6)9.6×28.5+0.285×40
=9.6×28.5+28.5×0.4
=(9.6+0.4)×28.5
=10×28.5
=285
=2.7+10.95
=13.65
(2)2.5×0.32×12.5
=(2.5×4)×(0.8×12.5)
=10×10
=100
(3)17.68÷5.2+2.7×1.5
=3.4+4.05
=7.45
(4)3.66×0.8+0.34×0.8-0.8
=(3.66+0.34-1)×0.8
=3×0.8
=2.4
(5)35.6-5×1.73
=35.6-8.65
=26.95
(6)9.6×28.5+0.285×40
=9.6×28.5+28.5×0.4
=(9.6+0.4)×28.5
=10×28.5
=285
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