Question

Помогите пожалуйста.

Answer 1

а) = 7а-(3а+а-1) = 7а-3а-а+1 = 3а+1; 
b) = -(2m+3m-4+m) = -2m-3m+4-m = -6m+4; 
c) = -(1-х+х-х+1) = -1+х-х+х-1 = х-2; 
d) = 4k+0,5-k-1 = 3k-0,5; 
e) = 2,5n+3-0,5n-7 = 2n-4; 
f) = -(3-(2-1+4,5у) = -(3-1-4,5у) = -2+4,5у