Question

Câu 1:ab*5=3ab

Câu 2:abc*9=1abc

Answer 1

1)

ab x 5 = 3ab 

ab x 5 = 300 + ab

ab x 4 = 300

ab = 300 : 4

ab = 75

2)

abc x 9 = 1abc 

abc x 9 = 1000 + abc 

abc x 8 = 1000

abc = 1000 : 8

abc = 125

Answer 2

Câu 1:

 ab = 75

 Vì 75.5=375

Câu 2:

 abc=125

 Vì abc.9=1125

Answer 3

1 75 

2 125