Salut !
1) 2,45 × 10⁸ > 1,46 × 10⁸ > 1,962 × 10⁷
2) 17/14 ÷ 5/7 - 2/5 = 17/14 × 7/5 - 2/5
= 119/70 - 28/70
= 91/70
= 13/10
3) (3y+4)² + (4y+1)(2y-4) = 9y²+24y+16+8y²-16y+2y-4
= 17y²+10y+12
4) 6x - 10 = 6 - 2x
⇒ 6x + 2x = 6 + 10
⇒ 8x = 16
⇒ x = 16/8 = 2
Code = 4510172
