Question

[Mai Thi An]

de tim so tu nhien x ,biet rang neu lay so dotru di 3 roi chia cho 8 thi dc12 ,ta co the viet (x-3) :8 =99

dang cach lam nhu tren ,hay tim so tu nhien x ,biet rang nhan 3 roi turu di 8 ,sau chia 4 thi dc 7

Answer 1

[Ice Wings]

Ta có: (x.3-8):4=7

=> (x.3-8)=7.4

=> x.3-8=28

=> x.3=28+8

=> x.3=36

=> x=12