Question

用豎式計(jì)算．

3.06×6.9	15.36÷1.2	2.34×1.5
6.49×0.85（保留兩位小數(shù)）	8.93÷3.8	8.64÷24．

Answer 1

考點(diǎn)：小數(shù)乘法,小數(shù)除法

專(zhuān)題：計(jì)算題

分析：①③④按照整數(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)．
②⑤⑥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．

解答： 解：①3.06×6.9=21.114

②15.36÷1.2=12.8

③2.34×1.5=3.51

④6.49×0.85≈5.52

⑤8.93÷3.8=2.35

⑥8.64÷24=0.36

點(diǎn)評(píng)：此題考查小數(shù)乘法，小數(shù)除法，小數(shù)乘法按整數(shù)乘法法則計(jì)算；小數(shù)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．