Question

13．直接寫得數(shù)

3$\frac{2}{5}$+0.3=	$\frac{3}{4}$×$\frac{5}{6}$=	$\frac{1}{4}$：$\frac{1}{3}$=	$\frac{7}{10}$×10×$\frac{3}{14}$=
1-$\frac{2}{5}$+$\frac{3}{5}$=	1÷$\frac{3}{2}$×$\frac{2}{3}$=	$\frac{1}{6}$×$\frac{2}{3}$÷$\frac{1}{3}$=	7×$\frac{3}{4}$÷7×$\frac{3}{4}$=
9-0.9=	72÷0.4=

Answer 1

分析 根據(jù)分?jǐn)?shù)和小數(shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算．

解答 解：

3$\frac{2}{5}$+0.3=3.7	$\frac{3}{4}$×$\frac{5}{6}$=$\frac{5}{8}$	$\frac{1}{4}$：$\frac{1}{3}$=$\frac{3}{4}$	$\frac{7}{10}$×10×$\frac{3}{14}$=$\frac{3}{2}$
1-$\frac{2}{5}$+$\frac{3}{5}$=$\frac{6}{5}$	1÷$\frac{3}{2}$×$\frac{2}{3}$=$\frac{4}{9}$	$\frac{1}{6}$×$\frac{2}{3}$÷$\frac{1}{3}$=$\frac{1}{3}$	7×$\frac{3}{4}$÷7×$\frac{3}{4}$=$\frac{9}{16}$
9-0.9=8.1	72÷0.4=180

點(diǎn)評 口算時(shí)，注意運(yùn)算符號和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．