比一比,看谁算得快。
1. $5 × \frac{2}{5} =$
2. $6 × \frac{1}{3} =$
3. $\frac{5}{7} × 5.6 =$
4. $\frac{8}{19} × 0.38 =$
5. $\frac{20}{21} × 0.42 =$
6. $0.2 × \frac{5}{8} =$
7. $5.5 × \frac{10}{11} =$
8. $0.9 × \frac{5}{18} =$
9. $0.2 × \frac{5}{6} =$
10. $\frac{7}{13} × 0.13 =$
11. $\frac{25}{44} × 1.1 =$
12. $\frac{7}{12} × 0.36 =$
13. $\frac{17}{72} × 1.6 =$
14. $2.4 × \frac{3}{8} =$
15. $\frac{3}{17} × 5.1 =$
1. $5 × \frac{2}{5} =$
2. $6 × \frac{1}{3} =$
3. $\frac{5}{7} × 5.6 =$
4. $\frac{8}{19} × 0.38 =$
5. $\frac{20}{21} × 0.42 =$
6. $0.2 × \frac{5}{8} =$
7. $5.5 × \frac{10}{11} =$
8. $0.9 × \frac{5}{18} =$
9. $0.2 × \frac{5}{6} =$
10. $\frac{7}{13} × 0.13 =$
11. $\frac{25}{44} × 1.1 =$
12. $\frac{7}{12} × 0.36 =$
13. $\frac{17}{72} × 1.6 =$
14. $2.4 × \frac{3}{8} =$
15. $\frac{3}{17} × 5.1 =$
答案:
$0.6 1.2 4 0.16 0.4 \frac{1}{8} 5 0.25 \frac{1}{6} \frac{7}{100} \frac{5}{8} 0.21 \frac{17}{45} 0.9 0.9$
列式计算。
(1) $4.8 m$ 的 $\frac{5}{6}$ 是多少米?
(2) $0.32 t$ 的 $\frac{1}{4}$ 是多少吨?
(1) $4.8 m$ 的 $\frac{5}{6}$ 是多少米?
(2) $0.32 t$ 的 $\frac{1}{4}$ 是多少吨?
答案:
$(1) 4.8×\frac{5}{6}=4(m) (2) 0.32×\frac{1}{4}=0.08(t)$
1. 水果店运来 $0.25 t$ 水果,其中苹果占 $\frac{2}{5}$,香蕉占 $\frac{3}{8}$。水果店运来苹果和香蕉各多少吨?
答案:
$1. 0.25×\frac{2}{5}=0.1(t) 0.25×\frac{3}{8}=\frac{3}{32}(t)$
2. 每千克花生米可榨油 $0.38 kg$。$\frac{5}{4} t$ 花生米可榨油多少千克?
答案:
$2. \frac{5}{4}×1000×0.38=475(kg)$
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