Question

ajutoooorr va roooggg!!

Answer 1

Răspuns:

1. X= 3 × 15 : 45 = 45 : 45 = 1

2. X= 5 × 20 : X = 100 : X = X × X = 100

-> Un X poate fi 100 si altul 1 adica, sunt 2 opțiuni.

Answer 2

$a) \: \tfrac{x}{3} = \tfrac{15}{45} \\ \tfrac{x}{3} = \tfrac{1}{3} \\ x = 1 \\ \\ \\ b) \tfrac{x}{5} = \tfrac{20}{x} \\ x {}^{2} = 20 \times 5 \\ x {}^{2} = 100 \\ x_{1} = 10 \\ x _{2} = - 10$