1.
-(-m-n)+(-f+b)=m+n+(-f+b)=m+n-f+b
2.
(x-5)-(7-x)+(9-x)=x-5-(7-x)+(9-x)=x-5-(7-x)+9-x=-5-(7-x)+9=-5-7+x+9=-3+x
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
1.
-(-m-n)+(-f+b)=m+n+(-f+b)=m+n-f+b
2.
(x-5)-(7-x)+(9-x)=x-5-(7-x)+(9-x)=x-5-(7-x)+9-x=-5-(7-x)+9=-5-7+x+9=-3+x