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1. 直接写出得数。(20☆)
$\frac{3}{4}×\frac{2}{5}=$
$\frac{1}{2}×8=$
$\frac{5}{6}×\frac{3}{10}=$
$4.2×\frac{2}{7}=$
$\frac{4}{9}×\frac{3}{8}=$
$\frac{7}{12}×\frac{4}{7}=$
$0.25×\frac{3}{5}=$
$\frac{5}{8}×\frac{4}{15}=$
$\frac{7}{10}×0.625=$
$\frac{9}{10}×\frac{5}{6}=$
$\frac{2}{3}×\frac{9}{4}=$
$0.36×\frac{5}{12}=$
$\frac{7}{8}×\frac{4}{7}=$
$\frac{5}{9}×\frac{3}{5}=$
$0.21×\frac{6}{7}=$
$\frac{3}{5}×\frac{10}{9}=$
$\frac{13}{15}×\frac{5}{26}=$
$4.8×\frac{7}{12}=$
$\frac{5}{6}×\frac{3}{4}=$
$\frac{8}{15}×\frac{5}{12}=$
$\frac{3}{4}×\frac{2}{5}=$
$\frac{1}{2}×8=$
$\frac{5}{6}×\frac{3}{10}=$
$4.2×\frac{2}{7}=$
$\frac{4}{9}×\frac{3}{8}=$
$\frac{7}{12}×\frac{4}{7}=$
$0.25×\frac{3}{5}=$
$\frac{5}{8}×\frac{4}{15}=$
$\frac{7}{10}×0.625=$
$\frac{9}{10}×\frac{5}{6}=$
$\frac{2}{3}×\frac{9}{4}=$
$0.36×\frac{5}{12}=$
$\frac{7}{8}×\frac{4}{7}=$
$\frac{5}{9}×\frac{3}{5}=$
$0.21×\frac{6}{7}=$
$\frac{3}{5}×\frac{10}{9}=$
$\frac{13}{15}×\frac{5}{26}=$
$4.8×\frac{7}{12}=$
$\frac{5}{6}×\frac{3}{4}=$
$\frac{8}{15}×\frac{5}{12}=$
答案
1.$\frac{3}{10}$
2.$4$
3.$\frac{1}{4}$
4.$\frac{6}{5}$
5.$\frac{1}{6}$
6.$\frac{1}{3}$
7.$\frac{3}{20}$
8.$\frac{1}{6}$
9.$\frac{7}{16}$
10.$\frac{3}{4}$
11.$\frac{3}{2}$
12.$\frac{3}{20}$
13.$\frac{1}{2}$
14.$\frac{1}{3}$
15.$\frac{9}{50}$
16.$\frac{2}{3}$
17.$\frac{1}{6}$
18.$\frac{14}{5}$
19.$\frac{5}{8}$
20.$\frac{2}{9}$
2.$4$
3.$\frac{1}{4}$
4.$\frac{6}{5}$
5.$\frac{1}{6}$
6.$\frac{1}{3}$
7.$\frac{3}{20}$
8.$\frac{1}{6}$
9.$\frac{7}{16}$
10.$\frac{3}{4}$
11.$\frac{3}{2}$
12.$\frac{3}{20}$
13.$\frac{1}{2}$
14.$\frac{1}{3}$
15.$\frac{9}{50}$
16.$\frac{2}{3}$
17.$\frac{1}{6}$
18.$\frac{14}{5}$
19.$\frac{5}{8}$
20.$\frac{2}{9}$
2. 先计算，再列出综合算式。（12☆）
综合算式：
综合算式：
综合算式：
$\frac{4}{5}-0.8×\frac{3}{4}=\frac{1}{5}$
综合算式：
$(\frac{3}{4}-\frac{2}{5})×(\frac{3}{7}+\frac{2}{7})=\frac{1}{4}$
答案
分步计算：
$\frac{4}{5}-0.8×\frac{3}{4}=\frac{4}{5}-\frac{3}{5}=\frac{1}{5}$
$(\frac{3}{4}-\frac{2}{5})×(\frac{3}{7}+\frac{2}{7})=\frac{7}{20}×\frac{5}{7}=\frac{1}{4}$
综合算式1：$\frac{4}{5}-0.8×\frac{3}{4}=\frac{1}{5}$
综合算式2：$(\frac{3}{4}-\frac{2}{5})×(\frac{3}{7}+\frac{2}{7})=\frac{1}{4}$
$\frac{4}{5}-0.8×\frac{3}{4}=\frac{4}{5}-\frac{3}{5}=\frac{1}{5}$
$(\frac{3}{4}-\frac{2}{5})×(\frac{3}{7}+\frac{2}{7})=\frac{7}{20}×\frac{5}{7}=\frac{1}{4}$
综合算式1：$\frac{4}{5}-0.8×\frac{3}{4}=\frac{1}{5}$
综合算式2：$(\frac{3}{4}-\frac{2}{5})×(\frac{3}{7}+\frac{2}{7})=\frac{1}{4}$
3. 计算下面各题,能简算的要简算。(18☆)
$\frac{5}{7}×14×\frac{3}{5}$
$(\frac{5}{6}+\frac{3}{4})×12$
$\frac{11}{13}×12+\frac{11}{13}$
$\frac{5}{12}×\frac{1}{4}+\frac{5}{12}×\frac{3}{4}$
$\frac{7}{10}×101-\frac{7}{10}$
$\frac{4}{5}×99+\frac{4}{5}$
$\frac{5}{7}×14×\frac{3}{5}$
$(\frac{5}{6}+\frac{3}{4})×12$
$\frac{11}{13}×12+\frac{11}{13}$
$\frac{5}{12}×\frac{1}{4}+\frac{5}{12}×\frac{3}{4}$
$\frac{7}{10}×101-\frac{7}{10}$
$\frac{4}{5}×99+\frac{4}{5}$
答案
1.$\frac{5}{7}×14×\frac{3}{5}=6$
2.$(\frac{5}{6}+\frac{3}{4})×12=19$
3.$\frac{11}{13}×12+\frac{11}{13}=11$
4.$\frac{5}{12}×\frac{1}{4}+\frac{5}{12}×\frac{3}{4}=\frac{5}{12}$
5.$\frac{7}{10}×101-\frac{7}{10}=70$
6.$\frac{4}{5}×99+\frac{4}{5}=80$
2.$(\frac{5}{6}+\frac{3}{4})×12=19$
3.$\frac{11}{13}×12+\frac{11}{13}=11$
4.$\frac{5}{12}×\frac{1}{4}+\frac{5}{12}×\frac{3}{4}=\frac{5}{12}$
5.$\frac{7}{10}×101-\frac{7}{10}=70$
6.$\frac{4}{5}×99+\frac{4}{5}=80$
