题目内容
脱式计算. 2004×8.1+1.9×2004 |
|
(1-
| ||||||||||||||||
4.38×0.75+3.62×0.75 | 12
|
35÷[(
|
分析:(1)(4)(5)可根据乘法分配律计算;
(2)(3)(6)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(2)(3)(6)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)2004×8.1+1.9×2004
=(8.1+1.9)×2004,
=10×2004,
=20040;
(2)
-(
+
×
)×
=
-(
+
)×
,
=
-
×
,
=
-
,
=0;
(3)(1-
)÷(
+
)
=
÷
,
=
;
(4)4.38×0.75+3.62×0.75
=(4.38+3.62)×0.75,
=8×0.75,
=6;
(5)12
×11-12.5
=12.5×11-12.5,
=(11-1)×12.5,
=10×12.5,
=125;
(6)35÷[(
-
)×3].
=35÷[
×3],
=35÷1,
=35.
=(8.1+1.9)×2004,
=10×2004,
=20040;
(2)
1 |
5 |
3 |
5 |
3 |
5 |
1 |
3 |
1 |
4 |
=
1 |
5 |
3 |
5 |
1 |
5 |
1 |
4 |
=
1 |
5 |
4 |
5 |
1 |
4 |
=
1 |
5 |
1 |
5 |
=0;
(3)(1-
3 |
4 |
3 |
10 |
1 |
5 |
=
1 |
4 |
1 |
2 |
=
1 |
2 |
(4)4.38×0.75+3.62×0.75
=(4.38+3.62)×0.75,
=8×0.75,
=6;
(5)12
1 |
2 |
=12.5×11-12.5,
=(11-1)×12.5,
=10×12.5,
=125;
(6)35÷[(
5 |
6 |
2 |
3 |
=35÷[
1 |
3 |
=35÷1,
=35.
点评:完成脱式计算时要注意计算过程的完整性,中间不要有太大跳跃.
练习册系列答案
相关题目