Question

【題目】列豎式計(jì)算．

①55.08÷8.5=

②7.8×8.15=

③3.425÷0.24=（得數(shù)保留兩位小數(shù)）

Answer 1

【答案】6.48；63.57；14.27

【解析】

試題分析：①先把除數(shù)的小數(shù)點(diǎn)向右移動(dòng)一位，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．

②按整數(shù)乘法的方法進(jìn)行計(jì)算，再看因數(shù)中一共有幾位小數(shù)，就從積的末尾起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．

③先把除數(shù)的小數(shù)點(diǎn)向右移動(dòng)二位，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，再將得數(shù)保留兩位小數(shù)．

解：①55.08÷8.5=6.48；

②7.8×8.15=63.57；

8.1 5

×7.8

57 0 5

③3.425÷0.24≈14.27．