Question

toate 3 si mai ofer si coroana !!; va roggg !!!

Answer 1

5^x=5 ⇔ x=1

2^x=2^7 ⇔ x=7

4^x=16 ⇔ 4^x=4^2 ⇔ x=2

7^x = 1 ⇔ x = 0

----------------------------------

x+5=25|-5 ⇔ x =20

x-36=4|+36 ⇔ x=40

5x=30 |:5 ⇔ x=6

2(x=3) = 14 |:2 ⇔  x+3 = 7 ⇔ x =4

3(x-2) =24 |:3 ⇔ x-2=8 ⇔ x = 10

------------------------------------------------

x≤ 0 ⇒ S= (-∞,  0]

x-3 > 7 |+3 ⇔ x>10 ⇒ S= (10,  ∞)

3(x+2) ≤ 27 |:3 ⇔ x+2 ≤ 9 |-2 ⇔  x ≤ 7 ⇒S = (-∞,  7]