求阴影部分的面积


第一个图形阴影部分面积:3.14×4²×3/4=37.68(cm²)
第二个图形阴影部分面积:3.14×(12²-8²)=251.2(cm²)
第一个图形阴影部分面积:3.14×4²×3/4=37.68(cm²)
第二个图形阴影部分面积:3.14×(12²-8²)=251.2(cm²)
答案:
第一个图形阴影部分面积:3.14×4²×3/4=37.68(cm²)
第二个图形阴影部分面积:3.14×(12²-8²)=251.2(cm²)
5/6÷7/12=10/7
6/7÷13/14=12/13
2/3÷5/6=4/5
3/5÷1/5=3
11/16÷5/8=11/10
6/25÷7/15=18/35
第二个图形阴影部分面积:3.14×(12²-8²)=251.2(cm²)
5/6÷7/12=10/7
6/7÷13/14=12/13
2/3÷5/6=4/5
3/5÷1/5=3
11/16÷5/8=11/10
6/25÷7/15=18/35
$\frac{5}{6}÷ \frac{7}{12}=$
$\frac{6}{7}÷ \frac{13}{14}=$
$\frac{2}{3}÷ \frac{5}{6}=$
$\frac{3}{5}÷ \frac{1}{5}=$
$\frac{11}{16}÷ \frac{5}{8}=$
$\frac{6}{25}÷ \frac{7}{15}=$
$\frac{6}{25}÷ \frac{3}{10}=$
$\frac{1}{3}÷ \frac{4}{5}=$
$\frac{1}{9}÷ \frac{7}{9}=$
$\frac{4}{7}× \frac{4}{7}=$
$\frac{5}{8}÷ \frac{3}{16}=$
$\frac{4}{7}÷ \frac{4}{7}=$
$\frac{10}{7}$
$\frac{6}{7}÷ \frac{13}{14}=$
$\frac{12}{13}$
$\frac{2}{3}÷ \frac{5}{6}=$
$\frac{4}{5}$
$\frac{3}{5}÷ \frac{1}{5}=$
3
$\frac{11}{16}÷ \frac{5}{8}=$
$\frac{11}{10}$
$\frac{6}{25}÷ \frac{7}{15}=$
$\frac{18}{35}$
$\frac{6}{25}÷ \frac{3}{10}=$
$\frac{4}{5}$
$\frac{1}{3}÷ \frac{4}{5}=$
$\frac{5}{12}$
$\frac{1}{9}÷ \frac{7}{9}=$
$\frac{1}{7}$
$\frac{4}{7}× \frac{4}{7}=$
$\frac{16}{49}$
$\frac{5}{8}÷ \frac{3}{16}=$
$\frac{10}{3}$
$\frac{4}{7}÷ \frac{4}{7}=$
1
答案:
解析:这些题目都是分数的除法或乘法运算。对于分数的除法,我们可以将其转化为乘法,即“除以一个数等于乘以这个数的倒数”。接下来,我们直接进行计算。
答案:
1. $\frac{5}{6} ÷ \frac{7}{12} = \frac{5}{6} × \frac{12}{7} = \frac{10}{7}$
2. $\frac{6}{7} ÷ \frac{13}{14} = \frac{6}{7} × \frac{14}{13} = \frac{12}{13}$
3. $\frac{2}{3} ÷ \frac{5}{6} = \frac{2}{3} × \frac{6}{5} = \frac{4}{5}$
4. $\frac{3}{5} ÷ \frac{1}{5} = \frac{3}{5} × 5 = 3$
5. $\frac{11}{16} ÷ \frac{5}{8} = \frac{11}{16} × \frac{8}{5} = \frac{11}{10}$
6. $\frac{6}{25} ÷ \frac{7}{15} = \frac{6}{25} × \frac{15}{7} = \frac{18}{35}$
7. $\frac{6}{25} ÷ \frac{3}{10} = \frac{6}{25} × \frac{10}{3} = \frac{4}{5}$
8. $\frac{1}{3} ÷ \frac{4}{5} = \frac{1}{3} × \frac{5}{4} = \frac{5}{12}$
9. $\frac{1}{9} ÷ \frac{7}{9} = \frac{1}{9} × \frac{9}{7} = \frac{1}{7}$
10. $\frac{4}{7} × \frac{4}{7} = \frac{16}{49}$
11. $\frac{5}{8} ÷ \frac{3}{16} = \frac{5}{8} × \frac{16}{3} = \frac{10}{3}$
12. $\frac{4}{7} ÷ \frac{4}{7} = 1$
答案:
1. $\frac{5}{6} ÷ \frac{7}{12} = \frac{5}{6} × \frac{12}{7} = \frac{10}{7}$
2. $\frac{6}{7} ÷ \frac{13}{14} = \frac{6}{7} × \frac{14}{13} = \frac{12}{13}$
3. $\frac{2}{3} ÷ \frac{5}{6} = \frac{2}{3} × \frac{6}{5} = \frac{4}{5}$
4. $\frac{3}{5} ÷ \frac{1}{5} = \frac{3}{5} × 5 = 3$
5. $\frac{11}{16} ÷ \frac{5}{8} = \frac{11}{16} × \frac{8}{5} = \frac{11}{10}$
6. $\frac{6}{25} ÷ \frac{7}{15} = \frac{6}{25} × \frac{15}{7} = \frac{18}{35}$
7. $\frac{6}{25} ÷ \frac{3}{10} = \frac{6}{25} × \frac{10}{3} = \frac{4}{5}$
8. $\frac{1}{3} ÷ \frac{4}{5} = \frac{1}{3} × \frac{5}{4} = \frac{5}{12}$
9. $\frac{1}{9} ÷ \frac{7}{9} = \frac{1}{9} × \frac{9}{7} = \frac{1}{7}$
10. $\frac{4}{7} × \frac{4}{7} = \frac{16}{49}$
11. $\frac{5}{8} ÷ \frac{3}{16} = \frac{5}{8} × \frac{16}{3} = \frac{10}{3}$
12. $\frac{4}{7} ÷ \frac{4}{7} = 1$
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