bjr
2(2x-3) - (5x-4) = 2*2x + 2*(-3) - 5x + 4 = 4x - 6 - 5x + 4
tu finis
(x+3) (2x+4) - 2(5x+6)
= x*2x + x*4 + 3*2x + 3*4 - 2*5x - 2*6
= 2x² + 4x + 6x + 12 - 10x - 12
= 2x² + 4x + 6x - 10x + 12 - 12
tu finis
2/3 - 5/6 + 1 = 4/6 - 5/6 + 6/6
tu finis (niveau 4eme)
(3/4)² - 1/4 = 9/16 - 4/16
tu finis (voir cours 4eme)
= 5/2 x 4/3
tu peux finir (4eme)
= 4/3 - (4x9x3) / (3x6x4) = 4/3 - 9/6 = 8/6 - 9/6
tu peux finir
= 3/4 - 1/2 x 5/3 = 3/4 - 5/6 = 9/12- 10/12
tu peux finir
1386 = 2 x 693 = 2 x 3 x 231 = 2 x 3 x 3 x 77 = 2 x 3 x 3 x 11 x 7
donc ?
= (6 x 28 / 14) x (10³ x 10⁻²) / 10⁻³ = 12 x 10⁴ = 1,2 x 10⁻¹ x 10⁴
tu finis
