题目内容

合理、灵活地计算.
85×
3
86

5
6
×
5
9
+
5
9
÷6
(2-0.6)÷
7
15
2-
6
13
÷
9
26
-
2
3
(
7
8
+
5
12
)÷
1
24
.
(1)85×
3
86
,
=(86-1)×
3
86
,
=86×
3
86
-1×
3
86
,
=3-
3
86
,
=2
83
86
;

(2)
5
6
×
5
9
+
5
9
÷6,
=
5
6
×
5
9
+
5
9
×
1
6
,
=
5
9
×(
5
6
+
1
6
),
=
5
9
×1,
=
5
9
;

(3)(2-0.6)÷
7
15
,
=1.4×
15
7
,
=3;

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

(5)(
7
8
+
5
12
)÷
1
24
,
=
31
24
×24,
=31.
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