题目内容

怎样算简便就怎样算.
3
4
+
5
8
×
2
5
5
3
-
2
7
-
5
7
7
9
÷
11
5
+
2
9
×
5
11
8
9
+(1-
3
4
)×
4
9
 
4.85-
5
9
+5.15-
4
9
     
1
13
+
12
13
×(
5
2
-
1
3
(1)
3
4
+
5
8
×
2
5

=
3
4
+
1
4

=1;

(2)
5
3
-
2
7
-
5
7

=
5
3
-(
2
7
+
5
7
),
=
5
3
-1,
=
2
3


(3)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11


(4)
8
9
+(1-
3
4
)×
4
9

=
8
9
+
1
4
×
4
9

=
8
9
+
1
9

=1;

(5)4.85-
5
9
+5.15-
4
9

=4.85+5.15-
5
9
-
4
9

=(4.85+5.15)-(
5
9
+
4
9
),
=10-1,
=9;

(6)
1
13
+
12
13
×(
5
2
-
1
3
),
=
1
13
+
12
13
×
13
6

=
1
13
+2,
=2
1
13
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