Question

【題目】列豎式計(jì)算。(除不盡的保留兩位小數(shù))

①347.6-29.8= ②0.048×1.5= ③174÷0.03=

④0.013×423= ⑤ 1.9÷0.03≈ ⑥0.28÷4.6≈

Answer 1

【答案】①317.8;②0.072;③5800

④5.499;⑤ 63.33;⑥0.06

【解析】

計(jì)算小數(shù)減法時(shí)要把小數(shù)點(diǎn)對(duì)齊；小數(shù)乘小數(shù)，按照整數(shù)乘法的計(jì)算方法計(jì)算出積，然后看兩個(gè)因數(shù)中共有幾位小數(shù)，就從積的右邊向左數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)；計(jì)算小數(shù)除以小數(shù)，把除數(shù)轉(zhuǎn)化成整數(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)幾位，然后根據(jù)除數(shù)是整數(shù)的小數(shù)除法計(jì)算。除不盡的運(yùn)用四舍五入的方法保留兩位小數(shù)即可。

①347.6-29.8=317.8

②0.048×1.5=0.072

③174÷0.03=5800

④0.013×423=5.499

⑤1.9÷0.03≈63.33

⑥0.28÷4.6≈0.06