Question

Urgent! 5+[45×2+(5×4-135÷a×3)-9×6]×6=251.Dau coronița!

Answer 1

Răspuns:

5+[90+(20- 135÷a×3) - 54]×6=251

[90+(20-135÷a×3)-54]×6=246

36+(20-135÷a×3)=41

20-135÷a×3=5

135÷a×3=15

135÷a=5

a=27

Answer 2

Răspuns:  a = 27

Explicație pas cu pas:

5 + [ 45 × 2 + ( 5 × 4 - 135 : a × 3 ) - 9 × 6 ] × 6 = 251

[ 90 + ( 20 - 135 : a × 3 ) - 54 ] × 6 = 251 - 5

[ 90 + ( 20 - 135 : a × 3 ) - 54 ] × 6 = 246

90 + ( 20 - 135 : a × 3 ) - 54 = 246 : 6

90 + ( 20 - 135 : a × 3 ) - 54 = 41

90 + ( 20 - 135 : a × 3 ) = 41 + 54

90 + ( 20 - 135 : a × 3 ) = 95

20 - 135 : a × 3 = 95 - 90

20 - 135 : a × 3 = 5

135 : a × 3 = 20 - 5

135 : a × 3 = 15

135 : a = 15 : 3

135 : a = 5

a = 135 : 5

a = 27 → numarul, aflat prin metoda mersului invers