2026年天天练口算四年级数学下册人教版第61页答案
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画一画
(1)平行四边形先向右平移5格,再向上平移4格。
(2)梯形先向下平移2格,再向左平移7格。

答案

(1)找到平行四边形的四个顶点,将这四个顶点分别向右平移5格,然后向上平移4格,最后依次连接平移后的四个顶点,得到向右平移5格,再向上平移4格后的平行四边形。
(2)找到梯形的四个顶点,将这四个顶点分别向下平移2格,然后向左平移7格,最后依次连接平移后的四个顶点,得到向下平移2格,再向左平移7格后的梯形。
(图略)。
630 + 70 =
7.8 + 4.65 =
4×25×12 =
125×8 =
4.2 - 2.19 =
125×7×8 =
40×25 =
10 - 2.6 =
(25 + 4)×4 =
470 - 280 =
12.4 + 4.47 =
(100 + 4)×3 =
640×2 =
0.35 + 0.49 =
4×12×25 =
250 - 190 =
1.4 - 0.5 =
8×4×125 =
860÷20 =
0.64 + 0.19 =
5×(20 + 8) =
280×3 =
12.3 - 4.5 =
6×25 + 4×25 =
700÷5 =
0.36 + 0.55 =
7×(100 + 3) =
125÷5 =
12 - 1.2 =
5×64×20 =
时间(
)

答案

1. $630 + 70 = 700$
2. $7.8 + 4.65 = 12.45$
3. $4×25×12 =100×12 = 1200$
4. $125×8 = 1000$
5. $4.2 - 2.19 = 2.01$
6. $125×7×8 =125×8×7 = 1000×7 = 7000$
7. $40×25 = 1000$
8. $10 - 2.6 = 7.4$
9. $(25 + 4)×4 =25×4 + 4×4 =100 + 16 = 116$
10. $470 - 280 = 190$
11. $12.4 + 4.47 = 16.87$
12. $(100 + 4)×3 =100×3 + 4×3 =300 + 12 = 312$
13. $640×2 = 1280$
14. $0.35 + 0.49 = 0.84$
15. $4×12×25 =4×25×12 =100×12 = 1200$
16. $250 - 190 = 60$
17. $1.4 - 0.5 = 0.9$
18. $8×4×125 =8×125×4 =1000×4 = 4000$
19. $860÷20 = 43$
20. $0.64 + 0.19 = 0.83$
21. $5×(20 + 8) =5×20+5×8 =100 + 40 = 140$
22. $280×3 = 840$
23. $12.3 - 4.5 = 7.8$
24. $6×25 + 4×25 =(6 + 4)×25 =10×25 = 250$
25. $700÷5 = 140$
26. $0.36 + 0.55 = 0.91$
27. $7×(100 + 3) =7×100+7×3 =700 + 21 = 721$
28. $125÷5 = 25$
29. $12 - 1.2 = 10.8$
30. $5×64×20 =5×20×64 =100×64 = 6400$