1. 看图在□里填数。
(1) $\frac{\square}{\square}+\frac{\square}{\square}+\frac{\square}{\square}=\frac{\square}{\square}$ $\frac{\square}{\square}\times3=\frac{\square}{\square}$
(2) $\frac{\square}{\square}+\frac{\square}{\square}=\frac{\square}{\square}$ $\frac{\square}{\square}\times2=\frac{\square}{\square}$
(1) $\frac{\square}{\square}+\frac{\square}{\square}+\frac{\square}{\square}=\frac{\square}{\square}$ $\frac{\square}{\square}\times3=\frac{\square}{\square}$
(2) $\frac{\square}{\square}+\frac{\square}{\square}=\frac{\square}{\square}$ $\frac{\square}{\square}\times2=\frac{\square}{\square}$
答案
2. 看图计算。

答案
3. 比一比,算一算。
$\frac{2}{7}+\frac{2}{7}=$ $\frac{3}{11}+\frac{3}{11}+\frac{3}{11}=$
$\frac{2}{7}\times2=$ $\frac{3}{11}\times3=$
$\frac{2}{7}+\frac{2}{7}=$ $\frac{3}{11}+\frac{3}{11}+\frac{3}{11}=$
$\frac{2}{7}\times2=$ $\frac{3}{11}\times3=$
答案
4. 填空。
$\frac{1}{4}+\frac{1}{4}+\frac{1}{4}=\frac{1}{\square}\times\square=\frac{\square}{\square}$
$\frac{1}{9}+\frac{2}{9}+\frac{3}{9}=\frac{1}{\square}\times\square=\frac{\square}{\square}$
$\frac{1}{4}+\frac{1}{4}+\frac{1}{4}=\frac{1}{\square}\times\square=\frac{\square}{\square}$
$\frac{1}{9}+\frac{2}{9}+\frac{3}{9}=\frac{1}{\square}\times\square=\frac{\square}{\square}$
答案
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