\(\left(a-b+c\right)-\left(a+c\right)\)
\(=a-b+c-a-c\)
\(=a-a+c-c-b=0-b\)
\(=-b\left(đpcm\right)\)
(a-b+c)-(a+c)=-b
=(a+c-b)-(a+c)
=(a+c)-b-(a+c)
=(a-c)-(a-c)-b
=0-b
=-b
chắc là zậy á
mình nha
=( a+ c - b ) - (a + c)
=( a + c) -b- (a + c )
=(a+c)-(a+c)-b
=0-b
=-b