问题 解答题
解方程.
10
11
-x=
2
3

x+2
7
12
=4.25
x-(1
2
3
+
1
6
)=4.5
37.5+
1
5
+x=69
1
2
答案

(1)

10
11
-x=
2
3

x=

10
11
-
2
3

x=

30
33
-
22
33

x=

8
33

(2)x+2

7
12
=4.25

x=4.25-2

7
12

x=4

3
12
-2
7
12

x=3

15
12
-2
7
12

x=1

2
3

(3)x-(1

2
3
+
1
6
)=4.5

x-(1

4
6
+
1
6
)=4.5

x-1

5
6
=4.5

x=4.5+1

5
6

x=4

1
2
+1
5
6

x=4

3
6
+1
5
6

x=6

1
3

(4)37.5+

1
5
+x=69
1
2

37.5+0.2+x=69.5

37.7+x=69.5

x=69.5-37.7

x=31.8.

单项选择题
单项选择题