问题 解答题
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
答案

(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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