Đáp án:
`7, (2. 39. 46. 64)/(48.13.6)`
`= (2.3.13.2. 4.8. 4^3)/(4.4.3.13.2.3)`
`= (2.8.4^2)/3`
`= (2^9)/3`
`8, (14.16.28.20)/(25.48.49)+1/2`
`= (2.7.2.8.4.7.4.5)/(5^2.4^2.3.7^2)+1/2`
`= (2.2.8.4.4)/3+1/2`
`= (2.2.2^3. 2^2. 2^2)/3+1/2`
`= (2^9)/3+1/2`
`= (2^10)/6+3/6`
`= (2^10+3)/6`
`= (1024+3)/6`
`= 1027/6`
`9, (15.49.63)/(81.21.25.6)`
`= (3.5.7^2.9.7)/(9^2.7.3.5^2.2.3)`
`= (7^2)/(9.5.2.3)`
`= 49/270`
