1.用系统命名法命名下列化合物:-|||-(1)(CH3)2 CHC(CH3)2-|||-CH3CHCH3-|||-(2) (H)_(3)C(H)_(2)CH-CHC(H)_(2)C(H)_(2)C(H)_(3)-|||-CH3 CH(CH3)2-|||-(3)CH3 CH2C(CH3 )2CH2CH3-|||-CH3CHCH3 CH2CH3-|||-(4)CH3 CH2CHCH 2CH2 CCH2CH3-|||-CH3-|||-(5)-|||-(6)