102×25.4+2.5×25.4×0.8怎么巧算
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简便计算
102×25.4-2.5×25.4×0.8
=102×25.4-(2.5×0.8)×25.4
=102×25.4-2×25.4
=(102-2)×25.4
=100×25.4
=2540
102×25.4-2.5×25.4×0.8
=102×25.4-(2.5×0.8)×25.4
=102×25.4-2×25.4
=(102-2)×25.4
=100×25.4
=2540
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102×25.4+2.5×25.4×0.8
=102×25.4+2.5×0.8×25.4
=102×25.4+2×25.4
=(100+4)×25.4
=100×25.4+4×25.4
=2641.6
这样算比较简便
=102×25.4+2.5×0.8×25.4
=102×25.4+2×25.4
=(100+4)×25.4
=100×25.4+4×25.4
=2641.6
这样算比较简便
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