F=B'CD'+BC'D+ACD+ABCD+A'B'CD+BC'D'+BCD
=ACD+A'B'CD+BD+B'CD'+BC'D'
=(A+A'B')CD+BD+(B⊕C)D'
=(ACD+A'B'CD+BD+(B⊕C)D'
=ACD+(A'C+B)D+(B⊕C)D'
= ACD+A'CD+BD+(B⊕C)D'
=(B+C)D+(B⊕C)D'
不能拍照么
