A, 88+220 17 B, 165+215 33 HD
Bài 36: Chứng minh rằng:
a,
8
8
+
2
20
17
b,
16
5
+
2
15
33
HD:
a, Ta có:
8
8
+
2
20
=
( )
2
3
8
+
2
20
=
2
24
+
2
20
=
2
20
(
2
4
+ =
1
)
2 .17 17
20
b, Ta có:
16
5
+
2
15
=
( )
2
4
5
+
2
15
=
2
20
+
2
15
=
2
15
(
2
5
+ =
1
)
2 .33 33
15