а) CH3-CH(CH3)-CH2-CH(CH3)-CH2-CH(CH2CH3)-CH3
б) CH3-CH(CH3)-CH2-CH(CH3)-CH(CH2CH3)-CH3
в) CH3-CH2-CH(CH3)-CH2-CH(CH3)-CH(CH3)-CH2-CH3
а) CH3-CH(CH3)-CH2-CH(CH3)-CH2-CH(CH2CH3)-CH3
б) CH3-CH(CH3)-CH2-CH(CH3)-CH(CH2CH3)-CH3
в) CH3-CH2-CH(CH3)-CH2-CH(CH3)-CH(CH3)-CH2-CH3