解:3.84×7.5=28.8
13.2÷2.4=5.5
分析:(1)根據(jù)小數(shù)乘法的計算法則列豎式計算即可:先按整數(shù)乘法法則算出積,再看被乘數(shù)有幾位小數(shù),就從積的右邊起數(shù)出幾位,點上小數(shù)點.
(2)先把除數(shù)的小數(shù)點向右移動兩位,使它變成整數(shù),除數(shù)的小數(shù)點向右移動幾位,被除數(shù)的小數(shù)點也向右移動相同的位數(shù),然后按著除數(shù)是整數(shù)方法進行計算.
點評:此題考查小數(shù)乘除法,在完成小數(shù)乘法計算意計算題目時要注意小數(shù)點位置的變化.除數(shù)是小數(shù)的除法,先移動除數(shù)的小數(shù)點使它變成整數(shù),然后按除數(shù)是整數(shù)除法計算.