A, (X+72)×4=320 B, (X−56)×7=749C, (X+3)×4=36 D, (X−5)×6=72

Câu 1: Tìm x biết:a, (x+72)×4=320 b, (x−56)×7=749c, (x+3)×4=36 d, (x−5)×6=72