Question

(ax2-40):(32:8)=5.......

Answer 1

(a×2-40)÷(32÷8)=5
(a×2-40)÷4=5
a×2-40=5×4
a×2-40=20
a×2=20+40
a×2=60
a=60÷2
a=30
verificare:
(30×2-40)÷(32÷8)=5
(60-40)÷4=5
20÷4=5

Answer 2

Răspuns:  30 → numarul

Explicație pas cu pas:

( a × 2 - 40 ) : ( 32 : 8 ) = 5

( a × 2 - 40 ) : 4 = 5

a × 2 - 40 = 5 × 4

a × 2 = 20 + 40

a × 2 = 60

a = 60 : 2

a = 30 → numarul, aflat prin metoda mersului invers

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Verific:  

( 30 × 2 - 40 ) : 4 = ( 60 - 40 ) : 4 = 20 : 4 = 5