Х=9 (9-5)(9+7)-(9-3)(9+5)=81+63-45-35-(81-27-15+45)=81+63-45-35-81-45+27+15=-20
Ответ:-20
х=11 (11-5)(11+7)-(11+5)(11-3)=121+77-55-35-(121-33+55-15)=121+77-55-35-121+33-55+15=-20
Ответ:-20
х=25 (25-5)(25+7)-(25-3)(25+5)=625+175-125-35-(625+125-75-15)=625+175-125-35-625-125+75+15=-20
Ответ:-20