题目内容

怎样算简便就怎样算.
1
8
×
7
11
+
4
11
×
1
8
2
3
+
7
6
×
3
14
18
7
-
1
2
÷
3
4
-
1
3
45×(
1
5
+
1
3
7
9
-
7
9
÷7
2
3
÷[
9
14
×(
5
6
-
4
9
)].
分析:(1)运用乘法分配律计算;
(2)先算乘法,再算加法;
(3)先算除法,按照从一个数里连续减去两个数等于从这个数里减去这两个数的和;
(4)运用乘法分配律计算;
(5)按照运算顺序计算即可;
(6)按照运算顺序计算即可.
解答:解:(1)
1
8
×
7
11
+
4
11
×
1
8

=(
7
11
+
4
11
)×
1
8

=1×
1
8

=
1
8


(2)
2
3
+
7
6
×
3
14

=
2
3
+
1
4

=
8
12
+
3
12

=
11
12


(3)
18
7
-
1
2
÷
3
4
-
1
3

=
18
7
-
2
3
-
1
3

=
18
7
-(
2
3
+
1
3
),
=
18
7
-1,
=
11
7


(4)45×(
1
5
+
1
3
),
=45×
1
5
+45×
1
3

=9+15,
=24;

(5)7÷
7
9
-
7
9
÷7,
=7×
9
7
-
7
9
×
1
7

=9-
1
9

=8
8
9


(6)
2
3
÷[
9
14
×(
5
6
-
4
9
)],
=
2
3
÷[
9
14
×
7
18
],
=
2
3
×4,
=
8
3
点评:解决本题要仔细分析数据,选取适合的方法解答.
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