1. 求$\frac{4}{5}$的$\frac{3}{8}$是多少,算式是(
$\frac{4}{5}×\frac{3}{8}$
);求$\frac{4}{5}$的8倍是多少,算式是($\frac{4}{5}×8$
)。答案
1.$\frac{4}{5}×\frac{3}{8}$;$\frac{4}{5}×8$
2. $\frac{3}{10} + \frac{3}{10} + \frac{3}{10} = (\quad) × (\quad)$
答案
2.$\frac{3}{10}$;3
3. $\frac{6}{7} × ( ) = \frac{3}{5} × ( ) = 9 × ( ) = 0.2 × ( ) = 1$
答案
3.$\frac{7}{6}$;$\frac{5}{3}$;$\frac{1}{9}$;5
4.一个正方形的边长是$\frac{1}{5}$米,它的周长是( )米,它的面积是( )平方米。
答案
4.$\frac{4}{5}$;$\frac{1}{25}$
5.一段公路全长是 1000 米,修好了$\frac{5}{8}$,修好了(
没有修。
625
)米,还剩下答案
5. 625米,剩余未修部分占全长的$\frac{3}{8}$
6.在○里填上“>”“<”或“=”。
$\frac{5}{8}×\frac{3}{4}$○$\frac{5}{8}$
$\frac{2}{3}×\frac{6}{5}$○$\frac{2}{3}$
$\frac{1}{6}×\frac{3}{8}$○$\frac{1}{4}×\frac{1}{4}$
$\frac{5}{8}×\frac{3}{4}$○$\frac{5}{8}$
$\frac{2}{3}×\frac{6}{5}$○$\frac{2}{3}$
$\frac{1}{6}×\frac{3}{8}$○$\frac{1}{4}×\frac{1}{4}$
答案
6. < ;> ;=
1. 直接写出得数。
$\frac{2}{7}×2 =$
$\frac{14}{19}÷\frac{7}{19} =$
$\frac{7}{12}+\frac{1}{2} =$
$4×(\frac{1}{12}+\frac{1}{4}) =$
$1÷0.25 =$
$5÷5÷\frac{1}{5} =$
$32 - 32×\frac{1}{8} =$
$(\frac{1}{4}-\frac{1}{5})×20 =$
$\frac{2}{7}×2 =$
$\frac{14}{19}÷\frac{7}{19} =$
$\frac{7}{12}+\frac{1}{2} =$
$4×(\frac{1}{12}+\frac{1}{4}) =$
$1÷0.25 =$
$5÷5÷\frac{1}{5} =$
$32 - 32×\frac{1}{8} =$
$(\frac{1}{4}-\frac{1}{5})×20 =$
答案
$\frac{4}{7}$
$2$
$\frac{13}{12}$
$\frac{4}{3}$
$4$
$5$
$28$
$1$
$2$
$\frac{13}{12}$
$\frac{4}{3}$
$4$
$5$
$28$
$1$
2. 脱式计算(能简算的要简算)。
$(\frac{3}{4} + \frac{5}{8}) × 32$
$\frac{4}{5} ÷ [ ( \frac{3}{5} + \frac{1}{2} ) × 2 ]$
$2 - \frac{3}{8} ÷ \frac{7}{16} - \frac{1}{7}$
$\frac{9}{17} ÷ 9 + \frac{1}{9} × \frac{8}{17}$
$(\frac{3}{4} + \frac{5}{8}) × 32$
$\frac{4}{5} ÷ [ ( \frac{3}{5} + \frac{1}{2} ) × 2 ]$
$2 - \frac{3}{8} ÷ \frac{7}{16} - \frac{1}{7}$
$\frac{9}{17} ÷ 9 + \frac{1}{9} × \frac{8}{17}$
答案
$(\frac{3}{4} + \frac{5}{8}) × 32$
$= \frac{3}{4}×32 + \frac{5}{8}×32$
$= 24 + 20$
$= 44$
$\frac{4}{5} ÷ [ ( \frac{3}{5} + \frac{1}{2} ) × 2 ]$
$= \frac{4}{5} ÷ [ (\frac{6}{10} + \frac{5}{10}) × 2 ]$
$= \frac{4}{5} ÷ [ \frac{11}{10} × 2 ]$
$= \frac{4}{5} ÷ \frac{11}{5}$
$= \frac{4}{5} × \frac{5}{11}$
$= \frac{4}{11}$
$2 - \frac{3}{8} ÷ \frac{7}{16} - \frac{1}{7}$
$= 2 - \frac{3}{8} × \frac{16}{7} - \frac{1}{7}$
$= 2 - \frac{6}{7} - \frac{1}{7}$
$= 2 - (\frac{6}{7} + \frac{1}{7})$
$= 2 - 1$
$= 1$
$\frac{9}{17} ÷ 9 + \frac{1}{9} × \frac{8}{17}$
$= \frac{9}{17} × \frac{1}{9} + \frac{1}{9} × \frac{8}{17}$
$= \frac{1}{9} × (\frac{9}{17} + \frac{8}{17})$
$= \frac{1}{9} × 1$
$= \frac{1}{9}$
$= \frac{3}{4}×32 + \frac{5}{8}×32$
$= 24 + 20$
$= 44$
$\frac{4}{5} ÷ [ ( \frac{3}{5} + \frac{1}{2} ) × 2 ]$
$= \frac{4}{5} ÷ [ (\frac{6}{10} + \frac{5}{10}) × 2 ]$
$= \frac{4}{5} ÷ [ \frac{11}{10} × 2 ]$
$= \frac{4}{5} ÷ \frac{11}{5}$
$= \frac{4}{5} × \frac{5}{11}$
$= \frac{4}{11}$
$2 - \frac{3}{8} ÷ \frac{7}{16} - \frac{1}{7}$
$= 2 - \frac{3}{8} × \frac{16}{7} - \frac{1}{7}$
$= 2 - \frac{6}{7} - \frac{1}{7}$
$= 2 - (\frac{6}{7} + \frac{1}{7})$
$= 2 - 1$
$= 1$
$\frac{9}{17} ÷ 9 + \frac{1}{9} × \frac{8}{17}$
$= \frac{9}{17} × \frac{1}{9} + \frac{1}{9} × \frac{8}{17}$
$= \frac{1}{9} × (\frac{9}{17} + \frac{8}{17})$
$= \frac{1}{9} × 1$
$= \frac{1}{9}$
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