求各图形的周长(单位:厘米)

1. 3.14×6÷2+6=15.42(厘米)
2. 3.14×10+20×2=71.4(厘米)
3. 8×3+3.14×8÷2=44.56(厘米)
4. 2×3.14×5=31.4(厘米)
1. 3.14×6÷2+6=15.42(厘米)
2. 3.14×10+20×2=71.4(厘米)
3. 8×3+3.14×8÷2=44.56(厘米)
4. 2×3.14×5=31.4(厘米)
答案:
1. 3.14×6÷2+6=15.42(厘米)
2. 3.14×10+20×2=71.4(厘米)
3. 8×3+3.14×8÷2=44.56(厘米)
4. 2×3.14×5=31.4(厘米)
2. 3.14×10+20×2=71.4(厘米)
3. 8×3+3.14×8÷2=44.56(厘米)
4. 2×3.14×5=31.4(厘米)
$\frac{4}{5}× \frac{4}{5}=$
$\frac{16}{15}× \frac{5}{8}=$
$\frac{4}{5}÷ \frac{4}{5}=$
$\frac{11}{10}-0.25=$
$\frac{5}{8}+\frac{3}{16}=$
$\frac{5}{2}÷ \frac{2}{5}=$
$2-1\frac{4}{5}=$
$2\frac{3}{4}-0.75=$
$\frac{6}{7}-\frac{2}{5}=$
$\frac{5}{9}÷ \frac{7}{6}=$
$\frac{2}{5}÷ \frac{2}{7}=$
$0÷ \frac{2}{5}=$
$\frac{16}{25}$
$\frac{16}{15}× \frac{5}{8}=$
$\frac{2}{3}$
$\frac{4}{5}÷ \frac{4}{5}=$
1
$\frac{11}{10}-0.25=$
0.85
$\frac{5}{8}+\frac{3}{16}=$
$\frac{13}{16}$
$\frac{5}{2}÷ \frac{2}{5}=$
$\frac{25}{4}$
$2-1\frac{4}{5}=$
$\frac{1}{5}$
$2\frac{3}{4}-0.75=$
2
$\frac{6}{7}-\frac{2}{5}=$
$\frac{16}{35}$
$\frac{5}{9}÷ \frac{7}{6}=$
$\frac{10}{21}$
$\frac{2}{5}÷ \frac{2}{7}=$
$\frac{7}{5}$
$0÷ \frac{2}{5}=$
0
答案:
$\frac{4}{5}× \frac{4}{5}=\frac{16}{25}$
$\frac{16}{15}× \frac{5}{8}=\frac{2}{3}$
$\frac{4}{5}÷ \frac{4}{5}=1$
$\frac{11}{10}-0.25=0.85$
$\frac{5}{8}+\frac{3}{16}=\frac{13}{16}$
$\frac{5}{2}÷ \frac{2}{5}=\frac{25}{4}$
$2-1\frac{4}{5}=\frac{1}{5}$
$2\frac{3}{4}-0.75=2$
$\frac{6}{7}-\frac{2}{5}=\frac{16}{35}$
$\frac{5}{9}÷ \frac{7}{6}=\frac{10}{21}$
$\frac{2}{5}÷ \frac{2}{7}=\frac{7}{5}$
$0÷ \frac{2}{5}=0$
$\frac{16}{15}× \frac{5}{8}=\frac{2}{3}$
$\frac{4}{5}÷ \frac{4}{5}=1$
$\frac{11}{10}-0.25=0.85$
$\frac{5}{8}+\frac{3}{16}=\frac{13}{16}$
$\frac{5}{2}÷ \frac{2}{5}=\frac{25}{4}$
$2-1\frac{4}{5}=\frac{1}{5}$
$2\frac{3}{4}-0.75=2$
$\frac{6}{7}-\frac{2}{5}=\frac{16}{35}$
$\frac{5}{9}÷ \frac{7}{6}=\frac{10}{21}$
$\frac{2}{5}÷ \frac{2}{7}=\frac{7}{5}$
$0÷ \frac{2}{5}=0$
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