CH3CH(CH3)CH2CH2CH3 能不能写成 CH3CH(CH3)(CH2)2 CH3

CH3CH(CH3)CH2CH2CH3 能不能写成 CH3CH(CH3)(CH2)2 CH3 CH3CH(CH3)C(CH3)2(CH2)2CH3 CH3CH(CH3)2结构式 CH3CH(CH3)C(CH3)2C(CH3)(C2H5)(CH2)2CH3 1、CH3(CH2)2CH(CH3)CH(C2H5)2 2、CH3CH(CH3)2 3、CH3CH(CH3)CH2C(C CH3CH(CH3)-CH2-CH2-CH2-CH(CH3)-CH2-CH(CH3)-CH3 CH3CH(CH3)CH2CH2CH(CH3)2 是什么? CH3CH(CH3)C(CH3)2(CH2)2CH3结构式怎么写 CH3CH(CH3)C(CH3)2(CH2)2CH3系统命名法 CH3CH=CHCH(CH3)CH3 CH3CH(CH3)CH2CH(CH3)C(CH3)2CH2CH2CH2CH(CH3)CH(CH3)CH3 请问这个的标 CH3CH(CH3)2什么意思?