Question

15:[11-(7x5-9x9:3:X):8+2x4]x3=3

Answer 1

Răspuns:  x = 9

Explicație pas cu pas:

15 : [ 11 - ( 7 × 5 - 9 × 9 : 3 : x ) : 8 + 2 × 4 ] × 3 = 3

15 : [ 11 - ( 35 - 81 : 3 : x ) : 8 + 8 ] = 3 : 3

11 - ( 35 - 27 : x ) : 8 + 8 = 15 : 1

11 - ( 35 - 27 : x ) : 8 = 15 - 8

11 - ( 35 - 27 : x ) : 8 = 7

( 35 - 27 : x ) : 8 = 11 - 7

35 - 27 : x = 4 × 8

27 : x = 35 - 32

27 : x = 3

x = 27 : 3

x = 9 → numarul, aflat prin metoda mersului invers