а) CH3-CHCH3CH3CH3-CH2-CH2-CH3б) CH3CH3CH33C-CH2-CHCH3CH3CH3-CH3в) CH3-CH2-CHCH3CH3CH3-CH2-CH2-CH2-CH2-CH3
а) CH3-CHCH3CH3CH3-CH2-CH2-CH3
б) CH3CH3CH33C-CH2-CHCH3CH3CH3-CH3
в) CH3-CH2-CHCH3CH3CH3-CH2-CH2-CH2-CH2-CH3