Răspuns:
1) 18 - 36 : (-2)² = 18 - 36 : 2² = 18 - 36 : 4 = 18 - 9 = 9
2) ma = (6+24):2 = 30:2 = 15
mg = √(6•24) = √144 = √12² = 12
Raportul este
[tex]\dfrac{m_a}{m_g} = \dfrac{15}{12} = \dfrac{5}{4} [/tex]
3) 35%•x = 84
x = 84•100:35 = 240 lei
4) -1 ≤ 2x+3 < 5 |-3
-1-3 ≤ 2x+3-3 < 5-3
-4 ≤ 2x < 2 |:2
-4:2 ≤ 2x:2 < 2:2
-2 ≤ x < 1 ⇒ x ∈ [-2; 1)
