Question

Tim 1 so co 2 chu so , biet rang neu viet them chu so 6 vao ben trai so do thi duoc so moi gap 9 lan so ban dau.

Answer 1

ab x 9 = 6ab

ab x 9 = 600 + ab

ab x 9 - ab = 600

ab x (9 - 1) = 600

ab = 600 : 8

ab = 75

cấm ai coppy

Answer 2

ab x 9 = 6ab

ab x 9 = 600 + ab

ab x 9 - ab = 600

ab x (9 - 1) = 600

ab = 600 : 8

ab = 75

Answer 3

ab x 9 = 6ab

ab x 9 = 600 + ab

ab x 9 - ab = 600

ab x (9 - 1) = 600

ab = 600 : 8

ab = 75