Question

75×4.7＋15.9×25怎样简便计算?

Answer 1

75×4.7＋15.9×25

=(3×25)×4.7+15.9×25

=3×4.7×25+15.9×25

=(3×4.7+15.9)×25

=(14.1+15.9)×25

=30×25

=750

或者

75×4.7+(5.3×3)×25

=75×4.7+5.3×75

=75×(4.7+5.3)

=75×10

=750