Question

合理、灵活地计算下面各题.0.25*16 3.14*45.4+54.6*3.14 6.15*9.4

Answer 1

0.25*16=0.25*4*4=1*4=4

3.14*45.4+54.6*3.14

=3.14*(45.4+54.6)

=3.14*100

=314

6.15*9.4

=(6+0.15)*(9+0.4)

=54+1.35+0.06+2.4

=54+1.41+2.4

=54+3.81

=57.81