问题 解答题
解方程.
(1)
5
6
-x=
1
2
(2)x+0.75-
3
5
=0.15(3)2x+
5
8
=4.625.
答案

(1)

5
6
-x=
1
2

5
6
-x+x=
1
2
+x,

1
2
+x=
5
6

1
2
+x-
1
2
=
5
6
-
1
2

x=

1
3

(2)x+0.75-

3
5
=0.15,

x+0.75-

3
5
+
3
5
=0.15+
3
5

x+0.75=0.75,

x+0.75-0.75=0.75-0.75,

x=0;

(3)2x+

5
8
=4.625,

2x+

5
8
-
5
8
=4.625-
5
8

2x=4,

2x÷2=4÷2,

x=2.

单项选择题
单项选择题