题目内容

用自己喜欢的方法计算:
5
7
﹢
5
6
﹢
2
7
﹢
1
6
(
5
6
﹢
5
8
)×
24
25
81×
79
80
3
5
﹢
1
2
×
4
5
2-
6
13
÷
9
26
-
2
3
[1-(
1
4
﹢
3
8
)]÷
1
4
.

(1)
5
7
+
5
6
+
2
7
+
1
6
,
=(
5
7
+
2
7
)+(
5
6
+
1
6
),
=1+1,
=2;

(2)(
5
6
+
5
8
)×
24
25
,
=
5
6
×
24
25
+
5
8
×
24
25
,
=
4
5
+
3
5
,
=
7
5
;

(3)81×
79
80
,
=(80+1)×
79
80
,
=80×
79
80
+1×
79
80
,
=79+
79
80
,
=79
79
80
;

(4)
3
5
+
1
2
×
4
5
,
=
3
5
+
2
5
,
=1;

(5)2-
6
13
÷
9
26
-
2
3
,
=2-
4
3
-
2
3
,
=2-(
4
3
+
2
3
),
=2-2,
=0;

(6)[1-(
1
4
+
3
8
)]÷
1
4
,
=[1-
5
8
]÷
1
4
,
=
3
8
÷
1
4
,
=
3
2
.
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