Question

8．計(jì)算下面各題．

10.8×2.3=	0.17×0.28=	1.19×4.6=
168÷0.28=	51.3÷0.27=	3.264÷3.2=

Answer 1

分析 根據(jù)小數(shù)的乘除法的豎式計(jì)算方法計(jì)算．
小數(shù)乘法法則：先把被乘數(shù)和乘數(shù)都看做整數(shù)，按照整數(shù)的乘法法則進(jìn)行計(jì)算，求出整數(shù)乘法的積，然后，再看被乘數(shù)和乘數(shù)一共有幾位小數(shù)，就從積的右邊起數(shù)出幾位，點(diǎn)上小數(shù)點(diǎn)．
小數(shù)除法的法則與整數(shù)除法的法則基本相同，根據(jù)商不變的性質(zhì)，把除數(shù)變成整數(shù)再計(jì)算．

解答 解：①10.8×2.3=24.84


②0.17×0.28=0.0476


③1.19×4.6=5.474


④168÷0.28=600


⑤51.3÷0.27=190


⑥3.264÷3.2=1.02

點(diǎn)評 本題考查了小數(shù)乘除法豎式計(jì)算的能力．是易錯(cuò)題．