Question

{10-2×[1+3:(2a-5)×2-2]}×5+10=10 Va roog . Nu stiu daca am rezolvat corect si vreau sa ma asigur. Multumesc.​

Answer 1

Răspuns: a = 3

Explicație pas cu pas:

{10 - 2 × [ 1 + 3 : ( 2 a - 5 ) × 2 - 2 ] } × 5 + 10 = 10

{10 - 2 × [ 1 + 3 : ( 2 a - 5 ) × 2 - 2 ] } × 5 = 10 - 10

10 - 2 × [ 1 + 3 : ( 2 a - 5 ) × 2 - 2 ] = 0 : 5

10 - 2 × [ 1 + 3 : ( 2 a - 5 ) × 2 - 2 ] = 0

2 × [ 1 + 3 : ( 2 a - 5 ) × 2 - 2 ] = 10 - 0

1 + 3 : ( 2 a - 5 ) × 2 - 2 = 10 : 2

1 + 3 : ( 2 a - 5 ) × 2 - 2 = 5

1 + 3 : ( 2 a - 5 ) × 2 = 5 + 2

3 : ( 2 a - 5 ) × 2 = 7 - 1

3 : ( 2 a - 5 ) = 6 : 2

3 : ( 2 a - 5 ) = 3

2 a - 5 = 3 : 3

2 a - 5 = 1

2 a = 1 + 5

2 a = 6

a = 6 : 2

a = 3 → numarul, aflat prin metoda mersului invers