题目内容

脱式计算,能简算的要简算
2
5
+
4
15
+
3
5
7
9
-
5
18
+
1
6
1
2
+
5
8
-
3
4
4
5
-(
2
15
+
1
3
)
1
2
-(
3
4
-
3
8
)
4
7
-
7
8
+
3
7
(1)
2
5
+
4
15
+
3
5

=(
2
5
+
3
5
)+
4
15

=1+
4
15

=1
4
15


(2)
7
9
-
5
18
+
1
6

=
14
18
-
5
18
+
3
18

=
14-5+3
18

=
2
3


(3)
1
2
+
5
8
-
3
4

=
4
8
+
5
8
-
6
8

=
4+5-6
8

=
3
8


(4)
4
5
-(
2
15
+
1
3
)

=
12
15
-(
2
15
+
5
15
)

=
12
15
-
7
15

=
1
3


(5)
1
2
-(
3
4
-
3
8
)

=
4
8
-(
6
8
-
3
8
)

=
4
8
-
3
8

=
1
8


(6)
4
7
-
7
8
+
3
7

=(
4
7
+
3
7
)-
7
8

=1-
7
8

=
1
8
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