89×10.1 ,10.2×97 ,1.1×10.3 怎么用简便方法计算?_数学解答

89×10.1 ,10.2×97 ,1.1×10.3 怎么用简便方法计算?

人气：148 ℃　时间：2020-10-02 04:06:55

解答

89×10.1
=89*(10+0.1)
=89*10+89*0.1
=890+8.9
=898.9
10.2×97
=(10+0.2)*97
=10*97+0.2*97
=970+19.4
=989.4
1.1×10.3
=(1+0.1)*10.3
=1*10.3+0.1*10.3
=10.3+1.03
=11.33