@Thỏ
`a) C1: 2205 : (35 times 7)`
`= 2205 : 245`
`= 9`
`C2: 2205 : (35 times 7)`
` = 9 times 35 times 7 : (35 times 7)`
`= 9 times [35 times 7 : (35 times 7)]`
`= 9 times 1`
`= 9`
`b) C1: 3332:(4 times 49)`
`= 3332 : 196`
`= 17`
`C2: 3332:(4 times 49)`
`= 17 times 4 times 49:(4 times 49)`
`= 17 times [4 times 49:(4 times 49)]`
`= 17 times 1`
`= 17`