Răspuns :

Cocirmariadenisid

Răspuns:  a = 93

Explicație pas cu pas:

60 - [ ( 2 × a - 15 ) : 3 - 9 ] : 6 = 52

[ ( 2 × a - 15 ) : 3 - 9 ] : 6 = 60 - 52

[ ( 2 × a - 15 ) : 3 - 9 ] : 6 = 8

( 2 × a - 15 ) : 3 - 9 = 8 × 6

( 2 × a - 15 ) : 3 - 9 = 48

( 2 × a - 15 ) : 3 = 48 + 9

( 2 × a - 15 ) : 3 = 57

2 × a - 15 = 57 × 3

2 × a - 15 = 171

2 × a = 171 + 15

2 × a = 186

a = 186 : 2

a = 93 → numarul, aflat prin metoda mersului invers

Răspuns:

[tex]60 - [ ( 2* a - 15 ) : 3 - 9 ] : 6 = 52\\\\( ( 2 * a - 15 ) : 3 - 9) : 6 = 60 - 52\\\\( ( 2 * a - 15 ) : 3 - 9 ) : 6 = 8\\\\( 2 * a - 15 ) : 3 - 9 = 8 * 6\\\\( 2 * a - 15 ) : 3 - 9 = 48\\\\( 2 * a - 15 ) : 3 = 48 + 9\\\\( 2 * a - 15 ) : 3 = 57\\\\2 * a - 15 = 57 * 3\\\\2 * a - 15 = 171\\\\2 * a = 171 + 15\\\\2* a = 186\\\\a = 186 : 2\\\\\boxed{a = 93}[/tex]