Răspuns :
[(8×2+6×a):2-48]×3=186
[(8×2+6×a):2-48]=186:3
[(8×2+6×a):2-48]=62
[(16+6×a):2-48]=62
[(16+6×a):2]=62+48
[(16+6×a):2]=110
[(16+6×a)]=110×2
[(16+6×a)]=220
6×a=220-16
6×a=204
a=204:6
a=34
[(8×2+6×a):2-48]=186:3
[(8×2+6×a):2-48]=62
[(16+6×a):2-48]=62
[(16+6×a):2]=62+48
[(16+6×a):2]=110
[(16+6×a)]=110×2
[(16+6×a)]=220
6×a=220-16
6×a=204
a=204:6
a=34
Răspuns
Explicație pas cu pas:
[ ( 8 × 2 + 6 × a ) : 2 - 48 ] × 3 = 186
( 16 + 6 × a ) : 2 - 48 = 186 : 3
( 16 + 6 × a ) : 2 - 48 = 62
( 16 + 6 × a ) : 2 = 62 + 48
( 16 + 6 × a ) : 2 = 110
16 + 6 × a = 110 × 2
16 + 6 × a = 220
6 × a = 220 - 16
6 × a = 204
a = 204 : 6
a = 34 → numarul, aflat prin metoda mersului invers