Объяснение:
a) (3a-2)(a/2-3a+1)= 3a²/2-9a²+3a-a+6a-2= -15/a²+8a-2
б) (x/2+6x-7(x+1))= x/2+6x-7x-7= -(1/2)x-7
в) (3a+ bc) ( a+b-c)= 3a(a+b-c)+bc(a+b-c)= 3a²+3ab-3ac+abc+b²c-bc²
г) (x/4 +x/3y +x/2y/2+xy/3+y/4(x-y))=x/4+xy/3+xy/4+xy/3+(xy-y²)/4 =
=x/4+11/12*xy+(xy-y²)/4
Объяснение:
a) (3a-2)(a/2-3a+1)= 3a²/2-9a²+3a-a+6a-2= -15/a²+8a-2
б) (x/2+6x-7(x+1))= x/2+6x-7x-7= -(1/2)x-7
в) (3a+ bc) ( a+b-c)= 3a(a+b-c)+bc(a+b-c)= 3a²+3ab-3ac+abc+b²c-bc²
г) (x/4 +x/3y +x/2y/2+xy/3+y/4(x-y))=x/4+xy/3+xy/4+xy/3+(xy-y²)/4 =
=x/4+11/12*xy+(xy-y²)/4