Question

Упростите выражения:
x-(x-(2x-4))=
-3n-(8m-3n)=
5(8-c)+11c=
8a-4 (3a+2)
7b-(3b-(2-3b))

Answer 1

x-(x-(2x-4))=x-(x-2x+4)=x-(-x+4)=x+x-4=2x-4
-3n-(8m-3n)=-3n-8m+3n=-8m
5(8-c)+11c=40-5c+11c=6c+40
8a-4(3a+2)=8a-12a-8=-4a-8
7b-(3b-(2-3b))=7b-(3b-2+3b)=7b-(6b-2)=7b-6b+2=b+2