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1. 直接写出得数。
$\frac{2}{9} × \frac{1}{4} =$
$\frac{3}{5} - \frac{1}{6} =$
$\frac{3}{11} × 7.7 =$
$\frac{2}{3} + \frac{3}{4} × 1 =$
$35 × \frac{5}{7} =$
$\frac{4}{13} × \frac{11}{12} =$
$\frac{18}{7} × 2.1 =$
$4 × ( \frac{3}{4} - \frac{1}{3} ) =$
$\frac{5}{11} × 4.4 =$
$\frac{1}{6} + \frac{3}{8} =$
$\frac{5}{12} × 4.8 =$
$\frac{1}{5} + \frac{4}{5} × \frac{3}{4} =$
$0.9 × \frac{2}{3} =$
$\frac{8}{25} × \frac{15}{4} =$
$\frac{4}{3} × \frac{9}{4} =$
$12 × ( \frac{1}{2} + \frac{1}{3} ) =$
$\frac{2}{9} × \frac{1}{4} =$
$\frac{3}{5} - \frac{1}{6} =$
$\frac{3}{11} × 7.7 =$
$\frac{2}{3} + \frac{3}{4} × 1 =$
$35 × \frac{5}{7} =$
$\frac{4}{13} × \frac{11}{12} =$
$\frac{18}{7} × 2.1 =$
$4 × ( \frac{3}{4} - \frac{1}{3} ) =$
$\frac{5}{11} × 4.4 =$
$\frac{1}{6} + \frac{3}{8} =$
$\frac{5}{12} × 4.8 =$
$\frac{1}{5} + \frac{4}{5} × \frac{3}{4} =$
$0.9 × \frac{2}{3} =$
$\frac{8}{25} × \frac{15}{4} =$
$\frac{4}{3} × \frac{9}{4} =$
$12 × ( \frac{1}{2} + \frac{1}{3} ) =$
答案
$\frac{2}{9} × \frac{1}{4} = \frac{1}{18}$
$\frac{3}{5} - \frac{1}{6} = \frac{13}{30}$
$\frac{3}{11} × 7.7 = 2.1$
$\frac{2}{3} + \frac{3}{4} × 1 = \frac{17}{12}$
$35 × \frac{5}{7} = 25$
$\frac{4}{13} × \frac{11}{12} = \frac{11}{39}$
$\frac{18}{7} × 2.1 = 5.4$
$4 × ( \frac{3}{4} - \frac{1}{3} ) = \frac{5}{3}$
$\frac{5}{11} × 4.4 = 2$
$\frac{1}{6} + \frac{3}{8} = \frac{13}{24}$
$\frac{5}{12} × 4.8 = 2$
$\frac{1}{5} + \frac{4}{5} × \frac{3}{4} = \frac{4}{5}$
$0.9 × \frac{2}{3} = 0.6$
$\frac{8}{25} × \frac{15}{4} = \frac{6}{5}$
$\frac{4}{3} × \frac{9}{4} = 3$
$12 × ( \frac{1}{2} + \frac{1}{3} ) = 10$
$\frac{3}{5} - \frac{1}{6} = \frac{13}{30}$
$\frac{3}{11} × 7.7 = 2.1$
$\frac{2}{3} + \frac{3}{4} × 1 = \frac{17}{12}$
$35 × \frac{5}{7} = 25$
$\frac{4}{13} × \frac{11}{12} = \frac{11}{39}$
$\frac{18}{7} × 2.1 = 5.4$
$4 × ( \frac{3}{4} - \frac{1}{3} ) = \frac{5}{3}$
$\frac{5}{11} × 4.4 = 2$
$\frac{1}{6} + \frac{3}{8} = \frac{13}{24}$
$\frac{5}{12} × 4.8 = 2$
$\frac{1}{5} + \frac{4}{5} × \frac{3}{4} = \frac{4}{5}$
$0.9 × \frac{2}{3} = 0.6$
$\frac{8}{25} × \frac{15}{4} = \frac{6}{5}$
$\frac{4}{3} × \frac{9}{4} = 3$
$12 × ( \frac{1}{2} + \frac{1}{3} ) = 10$
(1) $\frac{3}{5} × ( \frac{2}{3} - 2 × \frac{2}{9} ) = \frac{3}{5} × ( \_\_\_\_\_\_ - \_\_\_\_\_\_ ) = \_\_\_\_\_\_ × \_\_\_\_\_\_ = \_\_\_\_\_\_$。
答案
$\frac{3}{5} × ( \frac{2}{3} - 2 × \frac{2}{9} ) = \frac{3}{5} × ( \underline{\frac{2}{3}} - \underline{\frac{4}{9}} ) = \underline{\frac{3}{5}} × \underline{\frac{2}{9}} = \underline{\frac{2}{15}}$。
（2）一条红绳长$\frac{4}{5}$m，蓝绳的长度是红绳的$\frac{1}{2}$，红绳比蓝绳长m。
答案
$\frac{4}{5} × \frac{1}{2} = \frac{2}{5}$（m）
$\frac{4}{5} - \frac{2}{5} = \frac{2}{5}$（m）
答：红绳比蓝绳长$\frac{2}{5}$m。
$\frac{4}{5} - \frac{2}{5} = \frac{2}{5}$（m）
答：红绳比蓝绳长$\frac{2}{5}$m。
3.在○里填上“＞”“＜”或“=”。
$\frac{1}{4}+\frac{1}{4}+\frac{1}{3}$ ○ $\frac{1}{4}×3$
$\frac{2}{3}-\frac{1}{5}$ ○ $3×\frac{1}{5}$
$\frac{4}{25}×\frac{3}{4}$ ○ $\frac{2}{7}-\frac{1}{5}$
$\frac{9}{5}$ ○ $1-\frac{5}{9}×\frac{1}{5}$
$\frac{11}{8}×\frac{8}{11}$ ○ $5×\frac{1}{5}$
$\frac{3}{8}+1$ ○ $\frac{3}{8}×1$
地球绕太阳一周大约要365天，水星绕太阳一周所用时间比地球绕太阳一周所用时间的$\frac{1}{5}$多15天。水星绕太阳一周大约要多少天？
反思 我错了（）道题。 自我评价：
$\frac{1}{4}+\frac{1}{4}+\frac{1}{3}$ ○ $\frac{1}{4}×3$
$\frac{2}{3}-\frac{1}{5}$ ○ $3×\frac{1}{5}$
$\frac{4}{25}×\frac{3}{4}$ ○ $\frac{2}{7}-\frac{1}{5}$
$\frac{9}{5}$ ○ $1-\frac{5}{9}×\frac{1}{5}$
$\frac{11}{8}×\frac{8}{11}$ ○ $5×\frac{1}{5}$
$\frac{3}{8}+1$ ○ $\frac{3}{8}×1$
地球绕太阳一周大约要365天，水星绕太阳一周所用时间比地球绕太阳一周所用时间的$\frac{1}{5}$多15天。水星绕太阳一周大约要多少天？
反思 我错了（）道题。 自我评价：
答案
＞
＜
＞
＞
=
＞
$365×\frac{1}{5}+15=88$（天）
答：水星绕太阳一周大约要88天。
＜
＞
＞
=
＞
$365×\frac{1}{5}+15=88$（天）
答：水星绕太阳一周大约要88天。
