bonjour

• le double de  2 ⁷ = 2 ⁷ x 2 = 2 ⁸
• la moitié de  2 ⁴ = 2 ⁴ : 2 = 2 ⁵
• le triple de  3 ⁸ = 3 ⁸ x 3 = 3 ⁹
• le quart de  2 ¹⁰ = 2 ¹⁰ : 2 ² = 2 ⁸

36 ³ = 6 ⁶ car 36 =  (6²)³

27 ⁴ = ( 3 ³) ⁴

1) BC = 5/4 - 1/3 = 15/12 - 4/12 = 11/12

2) CA =  11/12 - 11/18 =  198/198 - 132/198 = 66/198 = 1/3

3) périmètre =  11/12 + 1/3 + 5/4 = 11/12 + 4/12 + 15/12 = 30/12 = 15/6