X×6 = 42X = 7 X 4 X = 42

Câu 2.a. 12 : x = 3 b. 21 : x = 7x = 12 : 3 x = 21 : 7x = 4 x = 3c. 30 : x = 3 e. 20 : x = 5x = 30 : 3 x = 20 : 5x = 10 x = 4d. x : 7 = 4 g. x×6 = 42x = 7 x 4 x = 42: 6x = 28 x = 7