14.56-2.99 13.45-3.19-2.81 (15.2-9.9 )-(4.3-2.540 )的简便算法

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14.56-2.99 13.45-3.19-2.81 (15.2-9.9 )-(4.3-2.540 )的简便算法

14.56-2.99 13.45-3.19-2.81 (15.2-9.9 )-(4.3-2.540 )的简便算法
14.56-2.99 13.45-3.19-2.81 (15.2-9.9 )-(4.3-2.540 )的简便算法

14.56-2.99 13.45-3.19-2.81 (15.2-9.9 )-(4.3-2.540 )的简便算法
14.56-2.99
=14.56-3+0.01
=11.56+0.01
=11.57
13.45-3.19-2.81
=13.45-(3.19+2.81)
=13.45-6
=7.45
(15.2-9.9 )-(4.3-2.540 )
=15.2-10+0.1-(4.3-2.54)
=5.2+0.1-4.3+2.54
=5.3-4.3+2.54
=1+2.54
=3.54

这些都是四年级数学新课堂上面的吧?