Упростите выражения a) A + B – C; б) A – B + C; в) B – A + C; г) C – B – A при условии

(A + B)(B + C)(A + C) = (AB + AC + BB + BC)(A + C) = = (AB + AC + B + BC)(A + C) = (AB + AC + B)(A + C) = (B + AC)(A + C) = = BA + BC + ACA + ACC = BA + BC + AC