Question

(5×a+3)×4-32=100 Rezolvare

Answer 1

( 5 × a + 3 ) × 4 - 32 = 100

( 5 × a + 3 ) × 4 = 100 + 32

( 5 × a + 3 ) × 4 = 132

5 × a + 3 = 132 : 4

5 × a + 3  = 33

5 × a = 33 - 3

5 × a = 30

a = 30 : 5

a = 6 → numarul, aflat prin metoda mersului invers

Verific:

( 5 × 6 + 3 ) × 4 - 32 = 100

= 33 × 4 - 32 =

= 132 - 32 =

= 100