3x-2y+(3x-4y)= 3a-4b+11c-(24+66-7c) = -(a+3b-c) +2b-5c= tolong jawab skrg

1) 3x-26+(3x-4y)
=> 3x+3x-2y-4y
=> 6x-6x

3x-2y+(3x-4y)=3x-2y+3x-4y
==> 3x+3x -2y-4y = 6x-6y

3a-4b+11c-(24+66-7c) = 3a-4b+11c-(90-7c)
= 3a-4b+11c-90-7c
= 3a-4b+4c-90

-(a+3b-c)+2b-5c = -a-3b-c+2b-5c
= -a-b-6c