题目内容
计算下列各题 (
|
(39+
| ||||||||||||||
|
| ||||||||||||||
1-
|
36÷(
|
分析:(1)(3)按照先算括号里面的,再算括号外面的顺序解答,
(2)(4)运用乘法分配律解答,
(5)按照先算第二级运算,再算第一级运算顺序解答,
(6)运用除法性质解答.
(2)(4)运用乘法分配律解答,
(5)按照先算第二级运算,再算第一级运算顺序解答,
(6)运用除法性质解答.
解答:解:(1)(
+
)÷
=
÷
=
;
(2)(39+
)×
=39×
+
×
=3+
=3
;
(3)
÷(
-
)
=
÷
=1
;
(4)
×
+
×
=(
+
)×
=1×
=
;
(5)1-
×
=1-
=
;
(6)36÷(
÷
)
=36÷
×
=45×
=24.
2 |
3 |
2 |
5 |
8 |
5 |
=
16 |
15 |
8 |
5 |
=
2 |
3 |
(2)(39+
26 |
27 |
1 |
13 |
=39×
1 |
13 |
26 |
27 |
1 |
13 |
=3+
2 |
27 |
=3
2 |
27 |
(3)
4 |
9 |
5 |
6 |
1 |
2 |
=
4 |
9 |
1 |
3 |
=1
1 |
3 |
(4)
4 |
7 |
5 |
12 |
3 |
7 |
5 |
12 |
=(
4 |
7 |
3 |
7 |
5 |
12 |
=1×
5 |
12 |
=
5 |
12 |
(5)1-
8 |
15 |
9 |
16 |
=1-
3 |
10 |
=
7 |
10 |
(6)36÷(
4 |
5 |
8 |
15 |
=36÷
4 |
5 |
8 |
15 |
=45×
8 |
15 |
=24.
点评:(1)依据四则运算顺序正确进行计算,(2)运用简便方法解决问题,是本题考查知识点.
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