题目内容

脱式计算(能简算的要简算).
15
1
2
-4
5
12
-3
3
8
4.63+5
8
11
+5.64+1
3
11
9
5
7
-(2
1
13
+4
5
7
+
11
13
)
18
11
-(
7
11
+
3
8
)
7
9
+
3
10
-
2
9
+
17
10
15
11
-
3
8
-
5
8

(1)15
1
2
-4
5
12
-3
3
8

=11
1
12
-3
3
8

=7
17
24


(2)4.63+5
8
11
+5.64+1
3
11

=(4.63+5.64)+(5
8
11
+1
3
11
),
=10.27+7,
=17.27;

(3)9
5
7
-(2
1
13
+4
5
7
+
11
13
)

=(9
5
7
-4
5
7
)-(2
1
13
+
11
13
)
),
=5-2
12
13

=2
1
13


(4)
18
11
-(
7
11
+
3
8
)

=
18
11
-
7
11
-
3
8

=1-
3
8

=
5
8


(5)
7
9
+
3
10
-
2
9
+
17
10

=(
7
9
-
2
9
)+(
3
10
+
17
10
),
=
5
9
+2,
=2
5
9


(6)
15
11
-
3
8
-
5
8

=
15
11
-(
3
8
+
5
8
)

=
15
11
-1,
=
4
11
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