数据电路逻辑分析怎么看出输出变量的逻辑式,真值表,谢谢了

L0 = I0
L1 = (I0 * I1)' ；与非门,后两级非门互相抵消,逻辑不变.
L2 = (I0 * I1)' * I1' * I2 ；与非门输出加非门,等于与门.
= （I0' + I1'）* I1' * I2
= I0' * I1' * I2 + I1' * I2
= (I0 +1) * I1' * I2
= I1' * I2
按照化简结果作出真值表.