Question

30. Aflați-l pe x din egalităţile: b)360-[3456:48 - (x: 28 +39 90): 180] : 4 = 347; c) 674-[(78-7-3042: 9): x]. 8 = 258; d) 32-80: {[(24 x-2) 7+6]: 5+6} = 24.
fara a​

Answer 1

Răspuns:

b)

360 - [72 - (x : 28 + 3510) : 180] : 4 = 347

[72 - (x : 28 + 3510) : 180] : 4 = 13

72 - (x : 28 + 3510) : 180 = 52

(x : 28 + 3510) : 180 = 20

x : 28 + 3510 = 3600

x : 28 = 90

x = 2520

c)

674 - [(546 - 338) : x ] • 8 = 258

(208 : x) • 8 = 416

208 : x = 52

x = 4

d)

32 - 80 : {[(24 • x - 2) • 7 + 6] : 5 + 6} = 24

80 :{[(24 • x - 2) • 7 + 6] : 5 + 6} = 8

[(24 • x - 2) • 7 + 6] : 5 + 6 = 10

[(24 • x - 2) • 7 + 6] : 5 = 4

(24 • x - 2) • 7 + 6 = 20

(24 • x - 2) • 7 = 14

24 • x - 2 = 2

24 • x = 4

x = 1/6