1. 直接写出得数。
$\frac{3}{5}+\frac{1}{5}=$
$1-\frac{1}{9}=$
$\frac{2}{9}+\frac{4}{9}=$
$\frac{3}{5}+\frac{1}{5}=$
$\frac{4}{5}$
$\frac{5}{6}-\frac{1}{6}=$$\frac{4}{6}$
$1-\frac{1}{9}=$
$\frac{8}{9}$
$\frac{1}{8}+\frac{3}{8}=$$\frac{4}{8}$
$\frac{2}{9}+\frac{4}{9}=$
$\frac{6}{9}$
$1-\frac{1}{5}=$$\frac{4}{5}$
答案:
$\frac{4}{5}$ $\frac{4}{6}$ $\frac{8}{9}$ $\frac{4}{8}$ $\frac{6}{9}$ $\frac{4}{5}$
$\frac{3}{7}+$
$\frac{2}{5}+$
$\frac{3}{7}$
$= \frac{6}{7}$ $\frac{2}{3}$
$+\frac{1}{3}= 1$$\frac{2}{5}+$
$\frac{3}{5}$
$= 1$ $\frac{3}{9}-$$\frac{1}{9}$
$= \frac{2}{9}$
答案:
$\frac{3}{7}$ $\frac{2}{3}$ $\frac{3}{5}$ $\frac{1}{9}$
3. 连一连。
答案:
4. 看图列式计算。


(1)
(2)
(3)
(1)
$\frac{4}{9}+\frac{4}{9}=\frac{8}{9}$
(2)
$\frac{4}{6}-\frac{2}{6}=\frac{2}{6}$
(3)
$1-\frac{4}{7}=\frac{3}{7}$
答案:
(1)$\frac{4}{9}+\frac{4}{9}=\frac{8}{9}$
(2)$\frac{4}{6}-\frac{2}{6}=\frac{2}{6}$
(3)$1-\frac{4}{7}=\frac{3}{7}$
(1)$\frac{4}{9}+\frac{4}{9}=\frac{8}{9}$
(2)$\frac{4}{6}-\frac{2}{6}=\frac{2}{6}$
(3)$1-\frac{4}{7}=\frac{3}{7}$
5. 浇花。

(1) 两组一共浇了花坛的几分之几?
(2) 还剩花坛的几分之几没浇?
(1) 两组一共浇了花坛的几分之几?
(2) 还剩花坛的几分之几没浇?
答案:
(1)$\frac{2}{9}+\frac{4}{9}=\frac{6}{9}$
(2)$1-\frac{6}{9}=\frac{3}{9}$
(1)$\frac{2}{9}+\frac{4}{9}=\frac{6}{9}$
(2)$1-\frac{6}{9}=\frac{3}{9}$
(1)
(2)
2
3
(2)
7
3
答案:
(答案不唯一)
(1)2 3
(2)7 3
(1)2 3
(2)7 3
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