16/
17
X
12 3 12
23/
=
X 3x 13
7
7
19/
1 -² - ( ³² ² - ²³ ) = ( ² + 1/1 + )
X
2 5
5
10
-2
9
21/ 2x-3--2-5-3x-
+
25
(x-1)² = ²/5²
9
1
6 3
17
X X
+
2 5
20/
22/
23/
17
10
1
6
5
4+3 (3-9-2-2x
=
x-1
4
5
2
3x
-
3 4
x+
+3)²
-
12 5
=
-
49
16
7
<--2
X
x-1
3
18/ +
X X
-2
5
||
21
34 12