问题 解答题

①37×0.25+63×0.25

②2.5×2.7×0.4

③0.125×5.6

④6.18×9.9+0.618.

答案

37×0.25+63×0.25,

=(37+63)×0.25,

=100×0.25,

=25;

②2.5×2.7×0.4,

=(2.5×0.4)×2.7,

=1×2.7,

=2.7;

③0.125×5.6,

=0.125×8×0.7,

=1×0.7,

=0.7;

④6.18×9.9+0.618,

=6.18×9.9+6.18×0.1,

=6.18×(9.9+0.1),

=6.18×10,

=61.8.

填空题
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