问题 解答题
解方程.
(1)5X-3×
7
10
=
7
5
(2)
4
5
+
1
2
X=
9
10
答案

(1)5X-3×

7
10
=
7
5

5x-

21
10
=
7
5

5x-

21
10
+
21
10
=
7
5
+
21
10

5x=

7
2

5x÷5=

7
2
÷5,

x=

7
10

(2)

4
5
+
1
2
x=
9
10

4
5
+
1
2
x-
4
5
=
9
10
-
4
5

1
2
x=
1
10

1
2
1
2
=
1
10
÷
1
2

x=

1
5

单项选择题 A1型题
判断题