Question

2010-(7x8+ax4-45:5x8)=2006

Answer 1

2 010 - ( 7 × 8 + a × 4 - 45 : 5 × 8 ) = 2 006

56 + a × 4 - 9 × 8 = 2 010 - 2 006

56 + a × 4 - 72 = 4

56 + a × 4 = 4 + 72

56 + a × 4 = 76

a × 4 = 76 - 56

a × 4 = 20

a = 20 : 4

a = 5 → numarul, aflat prin metoda mersului invers

Verific:

2 010 - ( 56 + 5 × 4 - 72 ) = 2006

= 2010 - ( 76 - 72 ) =

= 2010 - 4 =

= 2006