énoncés collège

Exercice 1.
Exercice 2. x√x+ 77 = √x+ 56 + 1
Exercice 3. ABC D [AB]E
[BC]F[AE]DEF
Exercice 4. ABCD (AB) (CD)AB = 3CD = 3DA
\
ADC = 120◦
\
CBA
Exercice 5. 100! 1 ×2×3× ··· × 100
100 100!
Exercice 6. (a, b) 1 6a630 3 6b6
30 a b b −2
Exercice 7.
Exercice 8.
3×3
Exercice 9. (a, b, c, d)
abcd = 98
(98,1,1,1) (1,1,98,1)
Exercice 10. 10 ×10
Exercice 11.
Exercice 12. 150◦
2017 180◦