题目内容
(2008?宜昌)
脱式计算. 1624÷56×12 |
208×(10.8-6.8)÷5.2 | ||||||||
13.4-(
|
| ||||||||
(
|
375+450÷18×25. |
分析:(1)(4)按照从左到右的顺序计算;
(2)先算小括号里面的减法,再算乘法,最后算除法;
(3)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的减法;
(5)运用乘法分配律简算;
(6)先算除法,再算乘法,最后算加法.
(2)先算小括号里面的减法,再算乘法,最后算除法;
(3)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的减法;
(5)运用乘法分配律简算;
(6)先算除法,再算乘法,最后算加法.
解答:解:(1)1624÷56×12
=29×12
=348
(2)208×(10.8-6.8)÷5.2
=208×4÷5.2
=832÷5.2
=160
(3)13.4-(
+24÷
)
=13.4-(
+10)
=13.4-10.6
=2.8
(4)
×18÷9×
=12÷9×
=
×
=
(5)(
+
-
)×96
=
×96+
×96-
×96
=84+56-80
=140-80
=60
(6)375+450÷18×25
=375+25×25
=375+625
=1000.
=29×12
=348
(2)208×(10.8-6.8)÷5.2
=208×4÷5.2
=832÷5.2
=160
(3)13.4-(
3 |
5 |
12 |
5 |
=13.4-(
3 |
5 |
=13.4-10.6
=2.8
(4)
2 |
3 |
1 |
4 |
=12÷9×
1 |
4 |
=
4 |
3 |
1 |
4 |
=
1 |
3 |
(5)(
7 |
8 |
7 |
12 |
5 |
6 |
=
7 |
8 |
7 |
12 |
5 |
6 |
=84+56-80
=140-80
=60
(6)375+450÷18×25
=375+25×25
=375+625
=1000.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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