选择合适的方法计算6.4×4.5+3.6×4.5 3.2÷0.8÷1.25  ...
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发布时间:2022-05-31 16:53
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时间:2023-10-20 03:24
(1)6.4×4.5+3.6×4.5
=(6.4+3.6)×4.5
=10×4.5
=45
(2)3.2÷0.8÷1.25
=3.2÷(0.8×1.25)
=3.2÷1
=3.2
(3)5.4×(7.2+10.5)
=5.4×17.7
=95.58
(4)5.3+4.7×2.8
=5.3+13.16
=18.46
(5)7.5÷2.5×0.4
=3×0.4
=1.2
(6)7.3×98
=7.3×100-7.3×2
=730-14.6
=715.4