题目内容

6
11
×17-12×
3
11

91×
1
13
+9÷13-1÷13×100

67×
65
66
+
1
66
3
4
+
3
28
+
3
70
+
3
130
+
3
208
(1)
6
11
×17-12×
3
11

=
6
11
×17-6×
6
11

=
6
11
×(17-6)
=
6
11
×11
=6;

(2)91×
1
13
+9÷13-1÷13×100

=94×
1
13
+9×
1
13
-
1
13
×100
=(94+9-100)×
1
13

=3×
1
13

=
3
13


(3)67×
65
66
+
1
66

=(66+1)×
65
66
+
1
66

=66×
65
66
+(
65
66
+
1
66

=65+1
=66;

(4)
3
4
+
3
28
+
3
70
+
3
130
+
3
208

=1-
1
4
+
1
4
-
1
7
+
1
7
-
1
10
+
1
10
-
1
13
+
1
13
-
1
16

=1-
1
16

=
15
16
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