Question

6．直接寫出得數(shù)

$4-\frac{7}{15}$=	$\frac{3}{5}÷\frac{7}{45}$=	$\frac{2}{9}×12$=	$（\frac{1}{4}-\frac{1}{5}）÷\frac{1}{20}$=
$\frac{1}{4}+\frac{1}{5}$=	$\frac{2}{3}÷\frac{3}{2}$=	$\frac{5}{51}×17$=	$\frac{3}{4}×\frac{5}{6}÷\frac{5}{6}×\frac{3}{4}$=
$\frac{8}{9}+\frac{4}{11}+\frac{1}{9}$=	$1-\frac{1}{6}-\frac{1}{6}$=	$\frac{1}{8}+\frac{2}{15}+\frac{7}{8}$=	$\frac{5}{6}+\frac{3}{4}-\frac{1}{3}$=

Answer 1

分析 $\frac{3}{4}×\frac{5}{6}÷\frac{5}{6}×\frac{3}{4}$先把除法變成乘法，再根據(jù)乘法交換律和結(jié)合律簡算；
$\frac{8}{9}+\frac{4}{11}+\frac{1}{9}$，$\frac{1}{8}+\frac{2}{15}+\frac{7}{8}$，$\frac{5}{6}+\frac{3}{4}-\frac{1}{3}$根據(jù)加法交換律簡算；
其它題目根據(jù)運算法則和運算順序直接求解．

解答 解：

$4-\frac{7}{15}$=3$\frac{8}{15}$	$\frac{3}{5}÷\frac{7}{45}$=$\frac{27}{7}$	$\frac{2}{9}×12$=$\frac{8}{3}$	$（\frac{1}{4}-\frac{1}{5}）÷\frac{1}{20}$=1
$\frac{1}{4}+\frac{1}{5}$=$\frac{9}{20}$	$\frac{2}{3}÷\frac{3}{2}$=$\frac{4}{9}$	$\frac{5}{51}×17$=$\frac{5}{3}$	$\frac{3}{4}×\frac{5}{6}÷\frac{5}{6}×\frac{3}{4}$=$\frac{9}{16}$
$\frac{8}{9}+\frac{4}{11}+\frac{1}{9}$=1$\frac{4}{11}$	$1-\frac{1}{6}-\frac{1}{6}$=$\frac{2}{3}$	$\frac{1}{8}+\frac{2}{15}+\frac{7}{8}$=1$\frac{2}{15}$	$\frac{5}{6}+\frac{3}{4}-\frac{1}{3}$=$\frac{5}{4}$

點評 本題考查了簡單的運算，要注意根據(jù)運算法則和運算定律快速準(zhǔn)確的得出答案．