-(4M-2N) при M= -9y-7b ; N=14-b

Question

-(4M-2N) при M= -9y-7b ; N=14-b

Answer 1

-(4м-2n)
Если м = -9y-7b и n = 14-b, то:
-((4(-9у-7b))-(2(14-b)))=
-((-36y-28b)-(28-2b))=
-(-36y-28b-28+2b)=
36y+28b+28-2b=
36y+26b+28

Answer 2

1) 4M = 4( - 9y - 7b ) = - 36y - 28b
2) 2N = 2( 14 - b ) = 28 - 2b
3) 4M - 2N = - 36y - 28b - ( 28 - 2b ) = - 36y - 28b - 28 + 2b = - 36y - 26b - 28
4) - ( 4M - 2N ) = - ( - 36y - 26b - 28 ) = 36y + 26b + 28
Ответ 36y + 26b + 28