Question

rezolzati in z ecuatia
1-4*[-5*(x-2)]=21

Answer 1

Răspuns:

1 - 4 · [ (-5) ·(x-2)] = 21

1-4· ( -5x +10) = 21

1 +20x - 40 =21

20x -39 = 21

20x = 21 + 39 = 60

x= 60 :20 = 3

x ∈ [-∞, 3]