题目内容

怎样简便就怎样计算.
2
9
-
7
16
×
2
9
87×
3
86
5
6
×
5
9
+
5
9
×
1
6
〔1-(
1
4
+
3
8
)〕÷
1
4
(
5
6
-
3
7
+
1
21
)÷
1
42
35
64
÷(
1
8
+
3
4
)
(1)
2
9
-
7
16
×
2
9
,
=
2
9
×
(1-
7
16
),
=
2
9
×
9
16
,
=
1
8
;

(2)87×
3
86
,
=1×
3
86
+86×
3
86
,
=
3
86
+3,
=3
3
86
;

(3)
5
6
×
5
9
+
5
9
×
1
6
,
=(
5
6
+
1
6
)×
5
9
,
=1×
5
9
,
=
5
9
;

(4)[1-(
1
4
+
3
8
)]÷
1
4
,
=[1-
5
8
]÷
1
4
,
=
3
8
÷
1
4
,
=1.5;

(5)(
5
6
-
3
7
+
1
21
)÷
1
42
,
=(
17
42
+
1
21
)÷
1
42
,
=
19
42
÷
1
42
,
=19;

(6)
35
64
÷(
1
8
+
3
4
),
=
35
64
÷
7
8
,
=
5
8
.
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