同学们,这里有40道题目,每做对1道题可夺得一面旗,比一比5分钟的时间里,谁夺得的旗帜最多。
$57× \frac{5}{19}=$
$\frac{2}{5}× \frac{15}{8}=$
$\frac{3}{8}÷ \frac{9}{10}=$
$\frac{3}{17}× 51× \frac{8}{9}=$
$\frac{1}{15}× \frac{5}{8}=$
$\frac{1}{4}÷ \frac{2}{3}=$
$\frac{7}{9}× \frac{81}{14}=$
$150× \frac{3}{5}+12=$
$10× \frac{4}{25}=$
$\frac{2}{7}÷ \frac{2}{7}=$
$\frac{1}{2}× \frac{3}{8}=$
$\frac{1}{2}× \frac{1}{3}× 6=$
$9÷ \frac{3}{4}=$
$\frac{5}{12}× \frac{3}{8}=$
$\frac{8}{9}× \frac{3}{16}=$
$\frac{4}{5}× \frac{1}{7}× 0=$
$\frac{2}{5}÷ \frac{1}{5}=$
$\frac{1}{3}-\frac{1}{4}=$
$\frac{5}{8}× \frac{1}{7}=$
$20× \frac{10}{31}× \frac{31}{10}=$
$\frac{2}{11}× \frac{2}{3}=$
$\frac{5}{6}÷ \frac{2}{9}=$
$20÷ \frac{1}{10}=$
$\frac{1}{12}÷ \frac{3}{4}× 9=$
$\frac{4}{15}÷ \frac{2}{5}=$
$\frac{3}{14}× 42=$
$\frac{1}{8}× \frac{16}{17}=$
$80+80× \frac{3}{8}=$
$\frac{9}{14}÷ \frac{3}{7}=$
$\frac{8}{9}÷ \frac{10}{27}=$
$\frac{3}{5}× \frac{1}{15}=$
$27× \frac{5}{9}+8=$
$\frac{3}{4}× \frac{9}{8}=$
$\frac{5}{7}÷ 4=$
$\frac{2}{7}÷ \frac{5}{7}=$
$\frac{3}{8}÷ \frac{3}{4}÷ \frac{2}{5}=$
$\frac{2}{3}-\frac{5}{12}=$
$\frac{7}{25}× 100=$
$\frac{3}{8}× 10=$
$\frac{13}{18}× 36× \frac{18}{13}=$
结果统计:我夺了()面旗帜。

$57× \frac{5}{19}=15$
$\frac{2}{5}× \frac{15}{8}=\frac{3}{4}$
$\frac{3}{8}÷ \frac{9}{10}=\frac{5}{12}$
$\frac{3}{17}× 51× \frac{8}{9}=8$
$\frac{1}{15}× \frac{5}{8}=\frac{1}{24}$
$\frac{1}{4}÷ \frac{2}{3}=\frac{3}{8}$
$\frac{7}{9}× \frac{81}{14}=\frac{9}{2}$
$150× \frac{3}{5}+12=102$
$10× \frac{4}{25}=\frac{8}{5}$
$\frac{2}{7}÷ \frac{2}{7}=1$
$\frac{1}{2}× \frac{3}{8}=\frac{3}{16}$
$\frac{1}{2}× \frac{1}{3}× 6=1$
$9÷ \frac{3}{4}=12$
$\frac{5}{12}× \frac{3}{8}=\frac{5}{32}$
$\frac{8}{9}× \frac{3}{16}=\frac{1}{6}$
$\frac{4}{5}× \frac{1}{7}× 0=0$
$\frac{2}{5}÷ \frac{1}{5}=2$
$\frac{1}{3}-\frac{1}{4}=\frac{1}{12}$
$\frac{5}{8}× \frac{1}{7}=\frac{5}{56}$
$20× \frac{10}{31}× \frac{31}{10}=20$
$\frac{2}{11}× \frac{2}{3}=\frac{4}{33}$
$\frac{5}{6}÷ \frac{2}{9}=\frac{15}{4}$
$20÷ \frac{1}{10}=200$
$\frac{1}{12}÷ \frac{3}{4}× 9=1$
$\frac{4}{15}÷ \frac{2}{5}=\frac{2}{3}$
$\frac{3}{14}× 42=9$
$\frac{1}{8}× \frac{16}{17}=\frac{2}{17}$
$80+80× \frac{3}{8}=110$
$\frac{9}{14}÷ \frac{3}{7}=\frac{3}{2}$
$\frac{8}{9}÷ \frac{10}{27}=\frac{12}{5}$
$\frac{3}{5}× \frac{1}{15}=\frac{1}{25}$
$27× \frac{5}{9}+8=23$
$\frac{3}{4}× \frac{9}{8}=\frac{27}{32}$
$\frac{5}{7}÷ 4=\frac{5}{28}$
$\frac{2}{7}÷ \frac{5}{7}=\frac{2}{5}$
$\frac{3}{8}÷ \frac{3}{4}÷ \frac{2}{5}=\frac{5}{4}$
$\frac{2}{3}-\frac{5}{12}=\frac{1}{4}$
$\frac{7}{25}× 100=28$
$\frac{3}{8}× 10=\frac{15}{4}$
$\frac{13}{18}× 36× \frac{18}{13}=36$
结果统计:我夺了(40)面旗帜。