Question

Упростите выражения:
a ( b + c - bc ) - b ( c + a - ac ) + c ( b - a )

Answer 1

a ( b + c - bc ) - b ( c + a - ac ) + c ( b - a )=ab+ac-abc-bc-ab+abc+bc-ac=0

Answer 2

a ( b + c - bc ) - b ( c + a - ac ) + c ( b - a )=ab+ac-abc-bc-ba+abc+bc-ac=0