1. 直接写出得数。
$\dfrac{1}{3}× 0=$ $\dfrac{1}{4}× \dfrac{2}{5}=$ $\dfrac{5}{6}× 12=$ $\dfrac{7}{12}× \dfrac{3}{14}=$ $45× \dfrac{3}{5}=$
$9× \dfrac{7}{18}=$ $\dfrac{2}{3}× \dfrac{9}{10}=$ $\dfrac{4}{25}× 100=$ $18× \dfrac{1}{6}=$ $\dfrac{4}{11}× \dfrac{11}{4}=$
$\dfrac{1}{3}× 0=$ $\dfrac{1}{4}× \dfrac{2}{5}=$ $\dfrac{5}{6}× 12=$ $\dfrac{7}{12}× \dfrac{3}{14}=$ $45× \dfrac{3}{5}=$
$9× \dfrac{7}{18}=$ $\dfrac{2}{3}× \dfrac{9}{10}=$ $\dfrac{4}{25}× 100=$ $18× \dfrac{1}{6}=$ $\dfrac{4}{11}× \dfrac{11}{4}=$
答案:
$1.0,\frac{1}{10},10,\frac{1}{8},\frac{1}{27},\frac{7}{2},\frac{3}{5},16,3,1$
2. 计算下面各题。
$24× \dfrac{2}{3}× \dfrac{1}{4}$ $\dfrac{7}{12}× 18× \dfrac{1}{6}$ $\dfrac{5}{12}× 36× \dfrac{4}{5}$
$\dfrac{7}{8}× \dfrac{3}{14}× \dfrac{4}{9}$ $\dfrac{3}{4}× \dfrac{5}{12}× 16$ $\dfrac{4}{51}× \dfrac{34}{35}× \dfrac{5}{8}$
$24× \dfrac{2}{3}× \dfrac{1}{4}$ $\dfrac{7}{12}× 18× \dfrac{1}{6}$ $\dfrac{5}{12}× 36× \dfrac{4}{5}$
$\dfrac{7}{8}× \dfrac{3}{14}× \dfrac{4}{9}$ $\dfrac{3}{4}× \dfrac{5}{12}× 16$ $\dfrac{4}{51}× \dfrac{34}{35}× \dfrac{5}{8}$
答案:
$2.4,\frac{7}{4},12,\frac{1}{12},5,\frac{1}{21}$
3. 看图列式并解答。
(1)

(2)

(1)
(2)
答案:
3.
(1)桃树120棵,梨树180棵
(2)4吨
(1)桃树120棵,梨树180棵
(2)4吨
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