小数乘除法练习题列如：3.15*4.55

小数乘除法练习题列如：3.15*4.55
小数乘除法练习题
列如：3.15*4.55

小数乘除法练习题列如：3.15*4.55
3.15
X 4.55
------------
1575
1575
1260
------------
143325
14.3325

3.15*4.55=14.3325
3.15
*4.55
____________
1575
1575
1260
____________
14.3325

⑿ 一辆汽车 0.5 小时行驶 15.2 千米,照这样计算,行驶 228 千米需要多少小时? ⒀ 用边长是 15 厘米的方砖给实验室铺地，需要 4000 块，如果改用边长 25 厘米的方砖铺地，需要多少块砖

3.15*4.55=14.3325
3.15
*4.55
____________
1575
1575
1260
____________
14.3325

3.15
X 4.55
------------
1575
1575
1260
------------
143325
14.3325

3.15*4.55=14.3325

3.15*4.55=14.3325
3.15
X 4.55
------------
1575
1575
1260
------------
143325

3.45
X9.78
--------
33.741
39.562
78.456
--------
151.759

3.15*4.55=14.3325
3.15
*4.55
____________
1575
1575
1260
____________
14.3325

3.15 * 4.55 = 14.3325
计算机都可以算咯~~！
13.42 * 4.73 =
9.65 * 8.12 =
7.23 * 1.2 =
6.3 * 12 =
2.14 * 8.3 =
4.9 * 1.12 =
21.98 * 2.31 =
0.24 * 28.37 =
29.13 * 3.14 =

全部展开

3.15 * 4.55 = 14.3325
计算机都可以算咯~~！
13.42 * 4.73 =
9.65 * 8.12 =
7.23 * 1.2 =
6.3 * 12 =
2.14 * 8.3 =
4.9 * 1.12 =
21.98 * 2.31 =
0.24 * 28.37 =
29.13 * 3.14 =
9.88 * 11.21 =
5.5 / 11 =
7.5 / 0.5 =
60 / 120 =
32 / 8 =
72 / 9 =
12 / 0.12 =
6.75 / 0.25 =
12 / 0.75 =
24 / 1.2 =
21 / 0.7 =

收起

3.15*4.55=14.3325

3.15
*4.55
------
15 75
157 5
1260
--------
14.3325

都是余数

3.1 5 * 4.5 5=1 4.3 3 2 5
3.15
*4.55
------------
1 5 7 5
1 5 7 5
1 2 6 0
------------
1 4.3 3 2 5

14.3325
jiafenba

3.15*4.55=(3.1+0.05)*(4.5+0.05)
=3.1*4.5+3.1*0.05+4.5*0.05+0.05*0.05
=4.5*(3+0.1)+(3.1+4.5)*0.05+0.0025
=4.5*3+4.5*0.1+7.6*0.05+0.0025
=13.5+0.45+0.38+0.0025
=13.5+(0.45+0.38)+0.00...

全部展开

3.15*4.55=(3.1+0.05)*(4.5+0.05)
=3.1*4.5+3.1*0.05+4.5*0.05+0.05*0.05
=4.5*(3+0.1)+(3.1+4.5)*0.05+0.0025
=4.5*3+4.5*0.1+7.6*0.05+0.0025
=13.5+0.45+0.38+0.0025
=13.5+(0.45+0.38)+0.0025
=13.5+0.83+0.0025
=13.5+(0.83+0.0025)
=13.5+0.8325
=14.3325
本题的意图是把复杂的乘法转化为简单的加法。

收起

tfhrthf

3.15*4.55=(3.1+0.05)*(4.5+0.05)
=3.1*4.5+3.1*0.05+4.5*0.05+0.05*0.05
=4.5*(3+0.1)+(3.1+4.5)*0.05+0.0025
=4.5*3+4.5*0.1+7.6*0.05+0.0025
=13.5+0.45+0.38+0.0025
=13.5+(0.45+0.38)+0.0025
=13.5+0.83+0.0025
=13.5+(0.83+0.0025)
=13.5+0.8325
=14.3325

3.15
X 4.55
------------
1575
1575
1260
------------
143325
14.3325
3.15*4.55=(3.1+0.05)*(4.5+0.05)
=3.1*4.5+3.1*0.05+4.5*0.05+0.05*0.05
=4.5*(3+0...

全部展开

3.15
X 4.55
------------
1575
1575
1260
------------
143325
14.3325
3.15*4.55=(3.1+0.05)*(4.5+0.05)
=3.1*4.5+3.1*0.05+4.5*0.05+0.05*0.05
=4.5*(3+0.1)+(3.1+4.5)*0.05+0.0025
=4.5*3+4.5*0.1+7.6*0.05+0.0025
=13.5+0.45+0.38+0.0025
=13.5+(0.45+0.38)+0.0025
=13.5+0.83+0.0025
=13.5+(0.83+0.0025)
=13.5+0.8325
=14.3325

收起