Correction du devoir page 194 n°3 c
2
.
5
2
+ 3
.
5
3
– 2
4
=
3 + 4
2
.
5 – (2
5
– 2
.
3
2
) =
7
2
- 5
.
(2
3
+ 3
3
) =
(3 + 2)
2
+ 3
.
(5 – 2)
3
– 2
3
.
3 =
2
5
– 2
.
(5
2
– 3
2
.
5) + 8
2
– 6
2
=