Question

7．計(jì)算：

$\frac{15}{16}$×$\frac{20}{21}$×$\frac{1}{5}$=	$\frac{9}{10}$×$\frac{2}{3}$×$\frac{5}{6}$=	$\frac{5}{4}$×$\frac{1}{8}$×16=
$\frac{2}{9}$×$\frac{3}{8}$÷$\frac{1}{6}$=	$\frac{6}{5}$÷$\frac{9}{10}$÷$\frac{4}{7}$=	$\frac{5}{14}$÷$\frac{6}{7}$×$\frac{8}{15}$=

Answer 1

分析 都只含有乘除法，按照從左向右的順序進(jìn)行計(jì)算．

解答 解：（1）$\frac{15}{16}$×$\frac{20}{21}$×$\frac{1}{5}$
=$\frac{25}{28}$×$\frac{1}{5}$
=$\frac{5}{28}$；

（2）$\frac{9}{10}$×$\frac{2}{3}$×$\frac{5}{6}$
=$\frac{3}{5}$×$\frac{5}{6}$
=$\frac{1}{2}$；

（3）$\frac{5}{4}$×$\frac{1}{8}$×16
=$\frac{5}{32}$×16
=$\frac{5}{2}$；

（4）$\frac{2}{9}$×$\frac{3}{8}$÷$\frac{1}{6}$
=$\frac{1}{12}$÷$\frac{1}{6}$
=$\frac{1}{2}$；

（5）$\frac{6}{5}$÷$\frac{9}{10}$÷$\frac{4}{7}$
=$\frac{4}{3}$÷$\frac{4}{7}$
=$\frac{7}{3}$；

（6）$\frac{5}{14}$÷$\frac{6}{7}$×$\frac{8}{15}$
=$\frac{5}{12}$×$\frac{8}{15}$
=$\frac{2}{9}$．

點(diǎn)評(píng) 只含有一級(jí)運(yùn)算的，按照從左向右的順序進(jìn)行計(jì)算．