题目内容

X+
1
6
x=7
x:
2
5
=2:3.5
2
9
+
1
2
÷
4
5
+
3
8
8
13
÷7+
1
7
×
6
13
2-
6
13
÷
9
26
-
2
3
12
5
×(
5
6
+
3
4
)+
4
5
(1)x+
1
6
x=7,
7
6
x=7,
7
6
x÷
7
6
=7÷
7
6

x=6;

(2)x:
2
5
=2:3.5,
3.5x=
2
5
×2,
3.5x=
4
5

3.5x÷3.5=
4
5
÷3.5,
x=
8
35


(3)
2
9
+
1
2
÷
4
5
+
3
8

=
2
9
+
5
8
+
3
8

=
2
9
+(
5
8
+
3
8
),
=
2
9
+1,
=1
2
9



(4)
8
13
÷7+
1
7
×
6
13

=
8
13
×
1
7
+
1
7
×
6
13

=(
8
13
+
6
13
)×
1
7

=
14
13
×
1
7

=
2
13


(5)2-
6
13
÷
9
26
-
2
3

=2-
6
13
×
26
9
-
2
3

=2-
4
3
-
2
3

=2-(
4
3
+
2
3
),
=2-2,
=0;

(6)
12
5
×(
5
6
+
3
4
)+
4
5

=
12
5
×
5
6
+
12
5
×
3
4
+
4
5

=2+
9
5
+
4
5

=2+(
9
5
+
4
5
),
=2+2
3
5

=4
3
5
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