题目内容

怎样算简便就怎样算.
5
7
+
8
9
+
2
7
+
1
9

1
6
×
7
10
+
3
10
÷6
1
3
×
3
4
÷(
3
4
-
5
12

2
3
+
1
6
)×24
4
9
×
3
4
×
9
11

(1-
1
2
-
1
4
)÷
1
8
分析:(1)运用加法交换律和结合律解答,
(2)(4)(6)运用乘法分配律解答,
(3)(5)运用乘法交换律解答.
解答:解:(1)
5
7
+
8
9
+
2
7
+
1
9

=(
5
7
+
2
7
)+(
8
9
+
1
9
),
=1+1,
=2;

(2)
1
6
×
7
10
+
3
10
÷6,
=(
7
10
+
3
10
)×
1
6

=1×
1
6

=
1
6


(3)
1
3
×
3
4
÷(
3
4
-
5
12
),
=
1
3
×
3
4
÷
1
3

=1×
3
4

=
3
4


(4)(
2
3
+
1
6
)×24,
=
2
3
×
24+
1
6
×
24,
=16+4,
=20;

(5)
4
9
×
3
4
×
9
11

=
4
9
×
9
11
×
3
4

=
4
11
×
3
4

=
3
11


(6)(1-
1
2
-
1
4
)÷
1
8

=1×8-
1
2
×8-
1
4
×
8,
=8-4-2,
=2.
点评:(1)运用简便方法解决问题,(2)依据四则运算顺序正确进行计算,是本题考查知识点.
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