问题 解答题
解方程.
3
10
+x=
3
5
x-
7
15
=
1
5
4
9
-x=
1
18
x-
1
10
-
2
5
=
2
5
3x-
1
7
=5
6
7
2x+
1
6
=1
1
6
答案

(1)

3
10
+x=
3
5

3
10
+x-
3
10
=
3
5
-
3
10

x=

3
10

(2)x-

7
15
=
1
5

x-

7
15
+
7
15
=
1
5
+
7
15

x=

2
3

(3)

4
9
-x=
1
18

4
9
-x-
1
18
+x=
1
18
-
1
18
+x,

x=

4
9
-
1
18

x=

8
18
-
1
18

x=

7
18

(4)x-

1
10
-
2
5
=
2
5

x-

1
10
-
2
5
+
1
10
+
2
5
=
2
5
+
1
10
+
2
5

x=

9
10

(5)3x-

1
7
=5
6
7

3x-

1
7
+
1
7
=5
6
7
+
1
7

3x=6,

3x÷3=6÷3,

x=2;

(6)2x+

1
6
=1
1
6

2x+

1
6
-
1
6
=1
1
6
-
1
6

2x=1,

x=

1
2

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