jawab yang no 19 dan 20

19. (5×4)² + 15²
= 20 + 225 = 245
= 4² + 3² = 16 + 9 = 25
= 245/25 = 49/5


20. 50²-20²
= 2500 - 400 = 2100
= 3² + 1² = 9 + 1 = 10
= 2100/10 = 210




semoga membantu :)