Question

7．計(jì)算．
$\frac{12}{13}$÷4=
$\frac{33}{5}$÷$\frac{3}{5}$=
10÷$\frac{5}{8}$=
9π=

Answer 1

分析 本題根據(jù)分?jǐn)?shù)除法的運(yùn)算法則計(jì)算即可：甲數(shù)除以乙數(shù)（0除外），等于甲數(shù)乘乙數(shù)的倒數(shù)．
π≈3.14，則9π=28.26．

解答 解：$\frac{12}{13}$÷4
=$\frac{12÷4}{13}$
=$\frac{3}{13}$

$\frac{33}{5}$÷$\frac{3}{5}$
=$\frac{33}{5}$×$\frac{5}{3}$
=11

10÷$\frac{5}{8}$
=10×$\frac{8}{5}$
=16

9π
=9×3.14
=28.26．

點(diǎn)評(píng) 完成本題要細(xì)心分析式中數(shù)據(jù)，注意約分．