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.