题目内容

神机妙算细又巧.
1
13
+
12
13
×(
5
2
-
1
3
)    
2
3
×[
9
10
÷(
7
16
-
1
4
)]
1
128
+
1
64
+
1
32
+…+
1
4

12×(
5
12
+
7
25
)×25.
(1)
1
13
+
12
13
×(
5
2
-
1
3
),
=
1
13
+
12
13
×
13
6

=
1
13
+2,
=2
1
13


(2)
2
3
×[
9
10
÷(
7
16
-
1
4
)],
=
2
3
×[
9
10
÷
3
16
],
=
2
3
×
24
5

=3
1
5


(3)
1
128
+
1
64
+
1
32
+…+
1
4

=
1
2
-
1
4
+
1
4
-
1
8
…+
1
16
-
1
32
+
1
32
-
1
64
+
1
64
-
1
128

=
1
2
-
1
128

=
63
128


(4)12×(
5
12
+
7
25
)×25,
=12×25×
5
12
+12×25×
7
25

=125+84,
=209.
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