问题 解答题

用简便方法计算.

(1)47×0.125×8

(2)0.65×201

(3)0.02×48.8×50

(4)1.45×6.5+0.55×6.5

(5)0.625×0.8×0.04×0.5

(6)18.8×101-18.8.

答案

(1)47×0.125×8

=47×(0.125×8),

=47×1,

=47;

(2)0.65×201

=0.65×(200+1),

=0.65×200+0.65,

=130+0.65,

=130.65;

(3)0.02×48.8×50

=0.02×50×48.8,

=1×48.8,

=48.8;

(4)1.45×6.5+0.55×6.5

=(1.45+0.55)×6.5,

=2×6.5,

=13;

(5)0.625×0.8×0.04×0.5

=(0.625×0.8)×(0.04×0.5),

=0.5×0.02,

=0.01;

(6)18.8×101-18.8

=(101-1)×18.8,

=100×18.8,

=1880.

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