0.45*72+45*0.18+4.5简便方法的答案_数学解答

0.45*72+45*0.18+4.5简便方法的答案

人气：234 ℃　时间：2020-01-24 13:57:49

解答

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