Metoda inversa : (y×8+640×6):4 = 3640

Răspuns :

( y × 8 + 640 × 6 ) : 4 = 3640

( y × 8 + 3840 ) : 4 = 3640

( y × 8 + 3840 ) = 3640 × 4

( y × 8 + 3840 ) = 14560

y × 8 = 14560 - 3840

y × 8 = 10720

y = 10720 : 8

y = 1340
Yx8+640=3640:4
Yx8+640=910
Yx8=910-640
Yx8=270
Y=270:8
Y=33 rest 6

Sper ca a fost corcta