Question

①37×0.25+63×0.25
②2.5×2.7×0.4
③0.125×5.6
④6.18×9.9+0.618．

Answer 1

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．