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简介:
1.用简便方法计算下面各题。
0.034×0.5×0.6
=0.034×(0.5×0.6)
=0.034×0.3
=0.0102 3.5×0.6+0.5×0.6
=(3.5+0.5)×0.6
=4×0.6
=2.4
4.75×99+4.75
=4.75×99+4.75×1
=4.75×(99+1)
=4.75×100
=475 2.73×99
=2.73×(100-1)
=2.73×100-2.73×1
=273-2.73
=270.27
2.简便方法计算下面各题。
0.01+1.01×99
=0.01+(1+0.01)×99
=0.01+1×99+0.01×99
=0.01+99+0.99
=0.01+0.99+99
=1+99
=100 99.66×6+66.78×18
=33.22×3×6+66.78×18
=33.22×(3×6)+66.78×18
=33.22×18+66.78×18
=(33.22+66.78)×18
=100×18
=1800