| b) | Réduis les sommes suivantes. |
7a
– 5a = |
2a |
–
2b + 8b = |
6b |
–
3a + a = |
– 2a |
5ab
– 2ab = |
3ab |
–
3a + 2a = |
– a |
–
3a – a = |
– 4a |
3a
– 7a = |
– 4a |
–
2b – 5b = |
– 7b |
2b
– 2b = |
0 |
2ab
– 5ab = |
– 3ab |
–
5b – 3b = |
– 8b |
–
5b – 2b = |
– 7b |
3a
– 4x = |
– x |
2x
+ 2x = |
4x |
–
2b + 5b = |
3b |