题目内容
脱式计算. 11÷3
|
(5
| ||||||||||||
[14.8+(3
|
(14-
|
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)把除法变为乘法,约分计算.
(2)先算括号内的,再算括号外的除法,最后算加法.
(3)先算小括号内的,再算中括号内的乘法,然后算中括号内的加法,最后算括号外的除法.
(4)把小数化为分数,两个括号同时计算,然后把除法变为乘法,约分计算.
(2)先算括号内的,再算括号外的除法,最后算加法.
(3)先算小括号内的,再算中括号内的乘法,然后算中括号内的加法,最后算括号外的除法.
(4)把小数化为分数,两个括号同时计算,然后把除法变为乘法,约分计算.
解答:
解:(1)11÷3
÷4
×
=11×
×
×
=(11×
)×(
×
)
=
×
=
(2)(5
-3
)÷2.5+2
=
÷
+2
=
×
+2
=
+2
=3
(3)[14.8+(3
-1.5)×1.12]÷2
=[14.8+(
-1.5)×1.12]÷2
=[14.8+
×1.12-1.5×1.12]÷2
=[14.8+3.68-1.68]÷2
=[14.8+2]÷2
=16.8×
=6.3
(4)(14-
)÷(
+
)×2.5
=
÷
×2.5
=
×
×
=
1 |
8 |
4 |
5 |
3 |
22 |
=11×
8 |
25 |
5 |
24 |
3 |
22 |
=(11×
3 |
22 |
8 |
25 |
5 |
24 |
=
3 |
2 |
1 |
15 |
=
1 |
10 |
(2)(5
5 |
12 |
17 |
36 |
5 |
6 |
=
35 |
18 |
5 |
2 |
5 |
6 |
=
35 |
18 |
2 |
5 |
5 |
6 |
=
7 |
9 |
5 |
6 |
=3
11 |
18 |
(3)[14.8+(3
2 |
7 |
2 |
3 |
=[14.8+(
23 |
7 |
2 |
3 |
=[14.8+
23 |
7 |
2 |
3 |
=[14.8+3.68-1.68]÷2
2 |
3 |
=[14.8+2]÷2
2 |
3 |
=16.8×
3 |
8 |
=6.3
(4)(14-
2 |
3 |
7 |
12 |
5 |
6 |
=
40 |
3 |
17 |
12 |
=
40 |
3 |
12 |
17 |
5 |
2 |
=
400 |
17 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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