4 = 1568 B, X × 2 = 1784C, (X + 234) × 2 = 9872 D, (X – 48)

Câu 2: Tìm x:

a, x : 4 = 1568 b, x × 2 = 1784

c, (x + 234) × 2 = 9872 d, (x – 48) : 4 = 5687