Question

5. Aflați x din :
a) 2035-x = 299

b) [5×(5x-5)-120]×5-25=125i

In paranteza rotutunda nu este înmulțit si x

Answer 1

a) 2035 - x = 299

-x = 299 - 2035

-x = -1736

x = -1736 / -1

x = 1736

b) [ 5 × ( 5x - 5 ) - 120 ] × 5 - 25 = 125

[ 5 × ( 5x - 5 ) - 120 ] × 5 = 125 + 25

[ 5 × ( 5x - 5 ) - 120 ] × 5 = 150

5 × ( 5x - 5 ) - 120 = 150 : 5

5 × ( 5x - 5 ) - 120 = 30

5 × ( 5x - 5 ) = 30 + 120

5 × ( 5x - 5 ) = 150 : 5

5x - 5 = 30

5x = 30 + 5

5x = 35

x = 35 : 5

x = 7