Question

10．用豎式計(jì)算．

0.25×0.036	0.35×180	0.29×3.04=
15.7÷5=	27.82÷13=	17.2÷20=

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)．如果小數(shù)的末尾出現(xiàn)0時(shí)，根據(jù)小數(shù)的基本性質(zhì)，要把它去掉．
小數(shù)的除法要按照整數(shù)的除法的計(jì)算方法計(jì)算．商的小數(shù)點(diǎn)要和被除數(shù)對(duì)齊．

解答 解：①0.25×0.036=0.009

②0.35×180=63

③0.29×3.04=0.8816

④15.7÷5=3.14

⑤27.82÷13=2.14

⑥17.2÷20=0.86

點(diǎn)評(píng) 豎式計(jì)算的關(guān)鍵是掌握豎式計(jì)算的方法，計(jì)算過(guò)程不要抄錯(cuò)數(shù)和運(yùn)算符號(hào)．