Question

豎式計(jì)算．

3.84×7.5=

13.2÷2.4=

Answer 1

分析：（1）根據(jù)小數(shù)乘法的計(jì)算法則列豎式計(jì)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(diǎn)上小數(shù)點(diǎn)．
（2）先把除數(shù)的小數(shù)點(diǎn)向右移動(dòng)兩位，使它變成整數(shù)，除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位，被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)，然后按著除數(shù)是整數(shù)方法進(jìn)行計(jì)算．

解答：解：3.84×7.5=28.8

13.2÷2.4=5.5

點(diǎn)評(píng)：此題考查小數(shù)乘除法，在完成小數(shù)乘法計(jì)算意計(jì)算題目時(shí)要注意小數(shù)點(diǎn)位置的變化．除數(shù)是小數(shù)的除法，先移動(dòng)除數(shù)的小數(shù)點(diǎn)使它變成整數(shù)，然后按除數(shù)是整數(shù)除法計(jì)算．