《2025年天天练口算五年级数学上册人教版》

9
计算
0.3 + 0.7 = 1
27 + 37 + 73 = 137
178 - 69 - 78 = 31
0.8 + 1.8 = 2.6
25 × (4 + 8) = 300
25 × 6 × 8 = 1200
7.9 - 7.9 = 0
47 × 21 + 47 × 29 = 2350
50 × 47 × 2 = 4700
3.4 - 0.8 = 2.6
125 × 4 × 8 = 4000
157 - 29 - 71 = 57
1.2 - 0.6 = 0.6
36 × 101 = 3636
234 + 178 + 266 = 678
10 - 0.9 = 9.1
25 × 32 × 125 = 100000
25 × 16 = 400
12.7 + 7.3 = 20
125 + 48 + 75 = 248
34 × 99 + 34 = 3400
1 - 0.21 = 0.79
15 × 99 + 15 = 1500
52 × 78 + 52 × 22 = 5200
2.6 - 0.6 = 2
78 × 101 - 78 = 7800
63 × 101 - 63 = 6300
1.95 - 0.9 = 1.05
235 - 77 - 23 = 135
75 × (100 + 2) = 7650

答案： 解析：
这些题目主要考查基础的算术运算、简便运算以及结合律、分配律等数学定律的应用。
答案：
$0.3 + 0.7 = 1$
$27 + 37 + 73 = 137$
$178 - 69 - 78 = 31$
$0.8 + 1.8 = 2.6$
$25 × (4 + 8) = 25 × 12 = 300$
$25 × 6 × 8 = 1200$
$7.9 - 7.9 = 0$
$47 × 21 + 47 × 29 = 47 × (21 + 29) = 47 × 50 = 2350$
$50 × 47 × 2 = 4700$
$3.4 - 0.8 = 2.6$
$125 × 4 × 8 = 4000$
$157 - 29 - 71 = 57$
$1.2 - 0.6 = 0.6$
$36 × 101 = 3636$
$234 + 178 + 266 = 678$
$10 - 0.9 = 9.1$
$25 × 32 × 125 = 100000$
$25 × 16 = 400$
$12.7 + 7.3 = 20$
$125 + 48 + 75 = 248$
$34 × 99 + 34 = 3400$
$1 - 0.21 = 0.79$
$15 × 99 + 15 = 1500$
$52 × 78 + 52 × 22 = 5200$
$2.6 - 0.6 = 2$
$78 × 101 - 78 = 7800$
$63 × 101 - 63 = 6300$
$1.95 - 0.9 = 1.05$
$235 - 77 - 23 = 135$
$75 × (100 + 2) = 75 × 102 = 7650$

4.5 × 6.7 = 6.7× 4.5
3.5 × 2.4 × 0.2 = 2.4× (3.5×0.2)
2.8 × 1.9 + 2.8 × 8.1 = 2.8× (1.9+8.1)
2.78 × 1.01 = 2.78× (1+0.01)
4.98 × 99 + 4.98 = 4.98× (99+1)
6.5 + 13.7 + 6.3 = 6.5+ (13.7+6.3)
4.8 × 1.25 = 6× (0.8×1.25)

答案： 解析：题目考查运算定律与简便运算，包括乘法交换律、结合律、分配律以及加法结合律。
答案：
4.5 × 6.7 = 6.7 × 4.5
3.5 × 2.4 × 0.2 = 2.4 × (3.5 × 0.2)
2.8 × 1.9 + 2.8 × 8.1 = 2.8 × (1.9 + 8.1)
2.78 × 1.01 = 2.78 × (1 + 0.01)
4.98 × 99 + 4.98 = 4.98 × (99 + 1)
6.5 + 13.7 + 6.3 = 6.5 + (13.7 + 6.3)
4.8 × 1.25 = 6 × (0.8 × 1.25)