登录
1) 练算理（填一填，算一算） 建议用时2分钟 评价：☆☆☆
$\frac{2}{9}×2=\frac{2×2}{9}=\frac{(\quad)}{(\quad)}$
$12×\frac{5}{16}=12^{(\quad)}×\frac{5}{16_{(\quad)}}=\frac{(\quad)}{(\quad)}$
$\frac{8}{15}×\frac{4}{7}=\frac{8×4}{15×7}=\frac{(\quad)}{(\quad)}$
$\frac{9}{10}×\frac{2}{3}=\frac{9^{(\quad)}}{10_{(\quad)}}×\frac{2^{(\quad)}}{3_{(\quad)}}=\frac{(\quad)}{(\quad)}$
$\frac{2}{5}×0.8=(\quad)×0.8=(\quad)$
$2.5×\frac{2}{5}=\frac{(\quad)}{(\quad)}×\frac{2}{5}=(\quad)$
$3.6×\frac{5}{6}=3.6^{0.6}×\frac{5}{6_1}=(\quad)$
$\frac{13}{24}×0.8=\frac{13}{24_{30}}×0.8^1=(\quad)$
$\frac{2}{9}×2=\frac{2×2}{9}=\frac{(\quad)}{(\quad)}$
$12×\frac{5}{16}=12^{(\quad)}×\frac{5}{16_{(\quad)}}=\frac{(\quad)}{(\quad)}$
$\frac{8}{15}×\frac{4}{7}=\frac{8×4}{15×7}=\frac{(\quad)}{(\quad)}$
$\frac{9}{10}×\frac{2}{3}=\frac{9^{(\quad)}}{10_{(\quad)}}×\frac{2^{(\quad)}}{3_{(\quad)}}=\frac{(\quad)}{(\quad)}$
$\frac{2}{5}×0.8=(\quad)×0.8=(\quad)$
$2.5×\frac{2}{5}=\frac{(\quad)}{(\quad)}×\frac{2}{5}=(\quad)$
$3.6×\frac{5}{6}=3.6^{0.6}×\frac{5}{6_1}=(\quad)$
$\frac{13}{24}×0.8=\frac{13}{24_{30}}×0.8^1=(\quad)$
答案
1. $\frac{4}{9}$
$12^{(3)}×\frac{5}{16_{(4)}}=\frac{15}{4}$
$\frac{32}{105}$
$\frac{9^{(3)}}{10_{(5)}}×\frac{2^{(1)}}{3_{(1)}}=\frac{3}{5}$
$0.4$ $0.32$
$\frac{5}{2}$ $1$ $3$ $\frac{13}{30}$
$12^{(3)}×\frac{5}{16_{(4)}}=\frac{15}{4}$
$\frac{32}{105}$
$\frac{9^{(3)}}{10_{(5)}}×\frac{2^{(1)}}{3_{(1)}}=\frac{3}{5}$
$0.4$ $0.32$
$\frac{5}{2}$ $1$ $3$ $\frac{13}{30}$
$\frac{5}{9} × 4 =$
$\frac{8}{27} × 2 =$
$5 × \frac{1}{3} =$
$8 × \frac{10}{7} =$
$\frac{7}{10} × \frac{3}{8} =$
$\frac{5}{6} × \frac{1}{8} =$
$\frac{8}{9} × \frac{3}{8} =$
$\frac{7}{15} × \frac{5}{7} =$
$12 × \frac{5}{8} =$
$\frac{2}{7} × \frac{3}{4} =$
$\frac{25}{24} × \frac{16}{15} =$
$\frac{14}{17} × \frac{17}{28} =$
$\frac{1}{4} × 2.8 =$
$\frac{8}{19} × 0.38 =$
$\frac{17}{72} × 0.8 =$
$\frac{6}{5} × 0.25 =$
$\frac{2}{27} × \frac{9}{10} =$
$\frac{8}{15} × \frac{25}{56} =$
$4.5 × \frac{2}{15} =$
$\frac{7}{18} × 27 =$
$\frac{8}{27} × 2 =$
$5 × \frac{1}{3} =$
$8 × \frac{10}{7} =$
$\frac{7}{10} × \frac{3}{8} =$
$\frac{5}{6} × \frac{1}{8} =$
$\frac{8}{9} × \frac{3}{8} =$
$\frac{7}{15} × \frac{5}{7} =$
$12 × \frac{5}{8} =$
$\frac{2}{7} × \frac{3}{4} =$
$\frac{25}{24} × \frac{16}{15} =$
$\frac{14}{17} × \frac{17}{28} =$
$\frac{1}{4} × 2.8 =$
$\frac{8}{19} × 0.38 =$
$\frac{17}{72} × 0.8 =$
$\frac{6}{5} × 0.25 =$
$\frac{2}{27} × \frac{9}{10} =$
$\frac{8}{15} × \frac{25}{56} =$
$4.5 × \frac{2}{15} =$
$\frac{7}{18} × 27 =$
答案
2. $\frac{20}{9}$
$\frac{16}{27}$
$\frac{5}{3}$
$\frac{80}{7}$
$\frac{21}{80}$
$\frac{5}{48}$
$\frac{1}{3}$
$\frac{1}{3}$
$\frac{15}{2}$
$\frac{3}{14}$
$\frac{10}{9}$
$\frac{1}{2}$
$0.7$
$0.16$
$\frac{17}{90}$
$0.3$
$\frac{1}{15}$
$\frac{5}{21}$
$0.6$
$\frac{21}{2}$
$\frac{16}{27}$
$\frac{5}{3}$
$\frac{80}{7}$
$\frac{21}{80}$
$\frac{5}{48}$
$\frac{1}{3}$
$\frac{1}{3}$
$\frac{15}{2}$
$\frac{3}{14}$
$\frac{10}{9}$
$\frac{1}{2}$
$0.7$
$0.16$
$\frac{17}{90}$
$0.3$
$\frac{1}{15}$
$\frac{5}{21}$
$0.6$
$\frac{21}{2}$
3 比大小（在○里填上“＞”“＜”或“=”）
建议用时2分钟 评价：☆☆☆
$\frac{10}{11}×\frac{8}{9}○\frac{10}{11}$
$\frac{10}{11}×1○\frac{10}{11}$
$\frac{10}{11}×\frac{10}{9}○\frac{10}{11}$
$18×\frac{5}{3}○18$
$4.6×\frac{3}{4}○\frac{3}{4}$
$11.2×\frac{8}{7}○11.2×\frac{5}{4}$
建议用时2分钟 评价：☆☆☆
$\frac{10}{11}×\frac{8}{9}○\frac{10}{11}$
$\frac{10}{11}×1○\frac{10}{11}$
$\frac{10}{11}×\frac{10}{9}○\frac{10}{11}$
$18×\frac{5}{3}○18$
$4.6×\frac{3}{4}○\frac{3}{4}$
$11.2×\frac{8}{7}○11.2×\frac{5}{4}$
答案
3. ＜ = ＞
＞ ＞ ＜
＞ ＞ ＜
$39×\frac{43}{78}$
$\frac{8}{21}×\frac{7}{16}$
$8.8×\frac{5}{22}$
$\frac{10}{121}×1.1$
$\frac{25}{32}×\frac{8}{45}$
$\frac{7}{123}×41$
$\frac{8}{21}×\frac{7}{16}$
$8.8×\frac{5}{22}$
$\frac{10}{121}×1.1$
$\frac{25}{32}×\frac{8}{45}$
$\frac{7}{123}×41$
答案
解：
1. $39×\frac{43}{78} = \frac{39×43}{78} = \frac{43}{2}$
2. $\frac{8}{21}×\frac{7}{16} = \frac{8×7}{21×16} = \frac{1}{6}$
3. $8.8×\frac{5}{22} = \frac{44}{5}×\frac{5}{22} = 2$
4. $\frac{10}{121}×1.1 = \frac{10}{121}×\frac{11}{10} = \frac{1}{11}$
5. $\frac{25}{32}×\frac{8}{45} = \frac{25×8}{32×45} = \frac{5}{36}$
6. $\frac{7}{123}×41 = \frac{7×41}{123} = \frac{7}{3}$
1. $39×\frac{43}{78} = \frac{39×43}{78} = \frac{43}{2}$
2. $\frac{8}{21}×\frac{7}{16} = \frac{8×7}{21×16} = \frac{1}{6}$
3. $8.8×\frac{5}{22} = \frac{44}{5}×\frac{5}{22} = 2$
4. $\frac{10}{121}×1.1 = \frac{10}{121}×\frac{11}{10} = \frac{1}{11}$
5. $\frac{25}{32}×\frac{8}{45} = \frac{25×8}{32×45} = \frac{5}{36}$
6. $\frac{7}{123}×41 = \frac{7×41}{123} = \frac{7}{3}$
