Ответ:
a-(b-c)=a-b+c
a-(-b+c)=a+b-c
a-(-b-c)=a+b+c
a-(b+c)=a-b-c
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Ответ:
a-(b-c)=a-b+c
a-(-b+c)=a+b-c
a-(-b-c)=a+b+c
a-(b+c)=a-b-c