а)CH3-CH(CH3)-CH(CH3)-CH(CH2-CH3)-CH2-CH3
б)CH3-CH(CH2-CH3)-C(CH2-CH3,CH3)-CH(CH3)-CH3
в)CH3-C(CH2-CH3,CH3)-CH3
г)CH3-C(CH2-CH3,CH2-CH3)-CH2-CH3
а)CH3-CH(CH3)-CH(CH3)-CH(CH2-CH3)-CH2-CH3
б)CH3-CH(CH2-CH3)-C(CH2-CH3,CH3)-CH(CH3)-CH3
в)CH3-C(CH2-CH3,CH3)-CH3
г)CH3-C(CH2-CH3,CH2-CH3)-CH2-CH3