Question

2.4x20.6+33.1x7.6的简便算法

Answer 1

2.4x20.6+33.1x7.6

=2.4*20.6+33.1*(10-2.4)

=2.4*20.6+33.1*10-33.1*2.4

=2.4*(20.6-33.1)+331

=2.4*(-12.5)+331

=-30+331

=301