Question

16．直接寫得數(shù)．

4×$\frac{7}{16}$=	$\frac{4}{5}$×$\frac{3}{4}$=	$\frac{4}{21}$×7=	$\frac{1}{5}$×3=
7×$\frac{2}{7}$=	9×$\frac{7}{18}$=	$\frac{2}{3}$×$\frac{9}{10}$=	$\frac{4}{25}$×100=
18×$\frac{1}{6}$=	$\frac{4}{11}$×$\frac{11}{4}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘法的運算方法口算即可，注意檢查．

解答 解：

4×$\frac{7}{16}$=1$\frac{3}{4}$	$\frac{4}{5}$×$\frac{3}{4}$=$\frac{3}{5}$	$\frac{4}{21}$×7=1$\frac{1}{3}$	$\frac{1}{5}$×3=$\frac{3}{5}$
7×$\frac{2}{7}$=2	9×$\frac{7}{18}$=3$\frac{1}{2}$	$\frac{2}{3}$×$\frac{9}{10}$=$\frac{3}{5}$	$\frac{4}{25}$×100=16
18×$\frac{1}{6}$=3	$\frac{4}{11}$×$\frac{11}{4}$=1

點評 此題主要考查了根據(jù)分?jǐn)?shù)乘法的運算方法口算的能力，要熟練掌握．