1.直接写出得数。
$\frac{4}{3} × \frac{15}{8} =$
$\frac{13}{4} × 1.2 =$
$0 × \frac{5}{24} =$
$\frac{11}{3} × 0.9 =$
$\frac{2}{13} × 13 =$
$\frac{9}{7} × \frac{14}{3} =$
$\frac{29}{60} × \frac{6}{29} =$
$3.5 × \frac{4}{5} =$
$\frac{4}{11} × 33 =$
$\frac{5}{7} × 56 =$
$\frac{12}{7} × 4.2 =$
$8 × \frac{11}{16} =$
$\frac{6}{5} × \frac{7}{6} =$
$\frac{4}{3} × 3.3 =$
$\frac{1}{8} × \frac{1}{9} =$
$10 × ( \frac{3}{5} - \frac{2}{5} ) =$
$\frac{4}{3} × \frac{15}{8} =$
$\frac{13}{4} × 1.2 =$
$0 × \frac{5}{24} =$
$\frac{11}{3} × 0.9 =$
$\frac{2}{13} × 13 =$
$\frac{9}{7} × \frac{14}{3} =$
$\frac{29}{60} × \frac{6}{29} =$
$3.5 × \frac{4}{5} =$
$\frac{4}{11} × 33 =$
$\frac{5}{7} × 56 =$
$\frac{12}{7} × 4.2 =$
$8 × \frac{11}{16} =$
$\frac{6}{5} × \frac{7}{6} =$
$\frac{4}{3} × 3.3 =$
$\frac{1}{8} × \frac{1}{9} =$
$10 × ( \frac{3}{5} - \frac{2}{5} ) =$
答案
$\frac{4}{3} × \frac{15}{8} = \frac{5}{2}$
$\frac{13}{4} × 1.2 = 3.9$
$0 × \frac{5}{24} = 0$
$\frac{11}{3} × 0.9 = 3.3$
$\frac{2}{13} × 13 = 2$
$\frac{9}{7} × \frac{14}{3} = 6$
$\frac{29}{60} × \frac{6}{29} = \frac{1}{10}$
$3.5 × \frac{4}{5} = 2.8$
$\frac{4}{11} × 33 = 12$
$\frac{5}{7} × 56 = 40$
$\frac{12}{7} × 4.2 = 7.2$
$8 × \frac{11}{16} = \frac{11}{2}$
$\frac{6}{5} × \frac{7}{6} = \frac{7}{5}$
$\frac{4}{3} × 3.3 = 4.4$
$\frac{1}{8} × \frac{1}{9} = \frac{1}{72}$
$10 × ( \frac{3}{5} - \frac{2}{5} ) = 2$
$\frac{13}{4} × 1.2 = 3.9$
$0 × \frac{5}{24} = 0$
$\frac{11}{3} × 0.9 = 3.3$
$\frac{2}{13} × 13 = 2$
$\frac{9}{7} × \frac{14}{3} = 6$
$\frac{29}{60} × \frac{6}{29} = \frac{1}{10}$
$3.5 × \frac{4}{5} = 2.8$
$\frac{4}{11} × 33 = 12$
$\frac{5}{7} × 56 = 40$
$\frac{12}{7} × 4.2 = 7.2$
$8 × \frac{11}{16} = \frac{11}{2}$
$\frac{6}{5} × \frac{7}{6} = \frac{7}{5}$
$\frac{4}{3} × 3.3 = 4.4$
$\frac{1}{8} × \frac{1}{9} = \frac{1}{72}$
$10 × ( \frac{3}{5} - \frac{2}{5} ) = 2$
2.连一连。

答案
$1.2×\frac{5}{6}×2$
$=1×2$
$=2$
$\frac{8}{9}×(\frac{1}{2}+\frac{1}{2})$
$=\frac{8}{9}×1$
$=\frac{8}{9}$
$2×\frac{11}{12}×\frac{1}{22}$
$=\frac{11}{6}×\frac{1}{22}$
$=\frac{1}{12}$
$\frac{3}{4}×\frac{2}{3}×1$
$=\frac{1}{2}×1$
$=\frac{1}{2}$
答:将$1.2×\frac{5}{6}×2$和得数2相连,将$\frac{8}{9}×(\frac{1}{2}+\frac{1}{2})$和得数$\frac{8}{9}$相连,将$2×\frac{11}{12}×\frac{1}{22}$和得数$\frac{1}{12}$相连,将$\frac{3}{4}×\frac{2}{3}×1$和得数$\frac{1}{2}$相连。
$=1×2$
$=2$
$\frac{8}{9}×(\frac{1}{2}+\frac{1}{2})$
$=\frac{8}{9}×1$
$=\frac{8}{9}$
$2×\frac{11}{12}×\frac{1}{22}$
$=\frac{11}{6}×\frac{1}{22}$
$=\frac{1}{12}$
$\frac{3}{4}×\frac{2}{3}×1$
$=\frac{1}{2}×1$
$=\frac{1}{2}$
答:将$1.2×\frac{5}{6}×2$和得数2相连,将$\frac{8}{9}×(\frac{1}{2}+\frac{1}{2})$和得数$\frac{8}{9}$相连,将$2×\frac{11}{12}×\frac{1}{22}$和得数$\frac{1}{12}$相连,将$\frac{3}{4}×\frac{2}{3}×1$和得数$\frac{1}{2}$相连。
3.在○里填上“>”“<”或“=”。
$\frac{9}{11}×11 ◯ 10×\frac{9}{11}$
$\frac{1}{2}+\frac{1}{2}×2 ◯ 2$
20分 $◯ \frac{1}{5}$时
$\frac{13}{18}×\frac{18}{13} ◯ \frac{21}{5}×\frac{2}{7}$
$0 ◯ \frac{5}{9}-\frac{5}{9}×\frac{1}{5}$
$\frac{3}{8}\mathrm{m}^3 ◯ 375\mathrm{dm}^3$
$\frac{9}{11}×11 ◯ 10×\frac{9}{11}$
$\frac{1}{2}+\frac{1}{2}×2 ◯ 2$
20分 $◯ \frac{1}{5}$时
$\frac{13}{18}×\frac{18}{13} ◯ \frac{21}{5}×\frac{2}{7}$
$0 ◯ \frac{5}{9}-\frac{5}{9}×\frac{1}{5}$
$\frac{3}{8}\mathrm{m}^3 ◯ 375\mathrm{dm}^3$
答案
$\frac{9}{11}×11=9$
$10×\frac{9}{11}=\frac{90}{11}$
$9>\frac{90}{11}$
$\frac{1}{2}+\frac{1}{2}×2=\frac{3}{2}$
$\frac{3}{2}<2$
$1时=60分$
$\frac{1}{5}时=60×\frac{1}{5}=12分$
$20分>12分$
$\frac{13}{18}×\frac{18}{13}=1$
$\frac{21}{5}×\frac{2}{7}=\frac{6}{5}$
$1<\frac{6}{5}$
$\frac{5}{9}-\frac{5}{9}×\frac{1}{5}=\frac{4}{9}$
$0<\frac{4}{9}$
$1\mathrm{m}^3=1000\mathrm{dm}^3$
$\frac{3}{8}\mathrm{m}^3=1000×\frac{3}{8}=375\mathrm{dm}^3$
$375\mathrm{dm}^3=375\mathrm{dm}^3$
答:依次填入的符号为>、<、>、<、<、=。
$10×\frac{9}{11}=\frac{90}{11}$
$9>\frac{90}{11}$
$\frac{1}{2}+\frac{1}{2}×2=\frac{3}{2}$
$\frac{3}{2}<2$
$1时=60分$
$\frac{1}{5}时=60×\frac{1}{5}=12分$
$20分>12分$
$\frac{13}{18}×\frac{18}{13}=1$
$\frac{21}{5}×\frac{2}{7}=\frac{6}{5}$
$1<\frac{6}{5}$
$\frac{5}{9}-\frac{5}{9}×\frac{1}{5}=\frac{4}{9}$
$0<\frac{4}{9}$
$1\mathrm{m}^3=1000\mathrm{dm}^3$
$\frac{3}{8}\mathrm{m}^3=1000×\frac{3}{8}=375\mathrm{dm}^3$
$375\mathrm{dm}^3=375\mathrm{dm}^3$
答:依次填入的符号为>、<、>、<、<、=。
根据已知条件,提出问题再解答。
学校1月份用电8000千瓦时,2月份比1月份节约了$\frac{1}{5}$。
反思 我错了()道题。 自我评价:
学校1月份用电8000千瓦时,2月份比1月份节约了$\frac{1}{5}$。
反思 我错了()道题。 自我评价:
答案
提出问题:2月份用电多少千瓦时?
$8000×(1-\dfrac{1}{5})$
$=8000×\dfrac{4}{5}$
$=6400$(千瓦时)
答:2月份用电6400千瓦时。
$8000×(1-\dfrac{1}{5})$
$=8000×\dfrac{4}{5}$
$=6400$(千瓦时)
答:2月份用电6400千瓦时。
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