Question

0.45*72+45*0.18+4.5简便方法的答案

Answer 1

0.45*72+45*0.18+4.5

=0.45*72+0.45*0.18*100+0.45*10

=0.45*72+0.45*18+0.45*10

=0.45*(72+18+10)

=0.45*100

=45