Question

9．直接寫出得數(shù)

$\frac{3}{4}$×16=	12÷$\frac{2}{5}$=	$\frac{3}{4}$×16=	$\frac{3}{5}$÷$\frac{9}{10}$=
2×$\frac{7}{8}$+$\frac{1}{8}$=	4-$\frac{1}{4}$=	$\frac{5}{7}$×$\frac{84}{25}$=	$\frac{9}{10}$÷$\frac{6}{15}$=
4.8÷$\frac{7}{6}$=	$\frac{7}{8}$×4×$\frac{8}{7}$=

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．
$\frac{7}{8}$×4×$\frac{8}{7}$根據(jù)乘法交換律進(jìn)行簡算．

解答 解：

$\frac{3}{4}$×16=12	12÷$\frac{2}{5}$=30	$\frac{3}{4}$×16=12	$\frac{3}{5}$÷$\frac{9}{10}$=$\frac{2}{3}$
2×$\frac{7}{8}$+$\frac{1}{8}$=$\frac{15}{8}$	4-$\frac{1}{4}$=3.75	$\frac{5}{7}$×$\frac{84}{25}$=$\frac{12}{5}$	$\frac{9}{10}$÷$\frac{6}{15}$=$\frac{9}{4}$
4.8÷$\frac{7}{6}$=$\frac{144}{35}$	$\frac{7}{8}$×4×$\frac{8}{7}$=4

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．