Question

2．直接寫出得數(shù)：

$\frac{3}{2}$÷$\frac{1}{2}$×2=	$\frac{8}{7}$×$\frac{7}{8}$×$\frac{14}{15}$=	$\frac{8}{9}$×0.1+0.9×$\frac{8}{9}$=
$\frac{4}{5}$×$\frac{16}{19}$+$\frac{16}{19}$×$\frac{1}{5}$=	$\frac{1}{7}$+$\frac{6}{7}$×7=	$\frac{1}{3}$×$\frac{1}{4}$÷$\frac{1}{3}$×$\frac{1}{4}$=

Answer 1

分析 根據(jù)小數(shù)和分數(shù)加減乘除法的計算方法進行計算．
$\frac{8}{9}$×0.1+0.9×$\frac{8}{9}$、$\frac{4}{5}$×$\frac{16}{19}$+$\frac{16}{19}$×$\frac{1}{5}$根據(jù)乘法分配律進行簡算．

解答 解：

$\frac{3}{2}$÷$\frac{1}{2}$×2=6	$\frac{8}{7}$×$\frac{7}{8}$×$\frac{14}{15}$=$\frac{14}{15}$	$\frac{8}{9}$×0.1+0.9×$\frac{8}{9}$=$\frac{8}{9}$
$\frac{4}{5}$×$\frac{16}{19}$+$\frac{16}{19}$×$\frac{1}{5}$=$\frac{16}{19}$	$\frac{1}{7}$+$\frac{6}{7}$×7=6$\frac{1}{7}$	$\frac{1}{3}$×$\frac{1}{4}$÷$\frac{1}{3}$×$\frac{1}{4}$=$\frac{1}{16}$

點評 口算時，注意運算符號和數(shù)據(jù)，然后再進一步計算．