Question

[cho ngu dau hoc]

bai 6 hay chung to 

a] neu a+b=c thi a=-b+c

b ] neu a-b=c thi a=b+c

bai 7 hay chung to

|a-b|=|b-a|

bai 8 tim x thuocZ biet

a] 6-|x|=2

b ] 6+|x|=2

to dang gap mong cac ban tra loi nhanh minh like phat

Answer 1

[Tạ Lương Minh Hoàng]

8)

a)6-|x|=2

=>6-x=2

x=6-2

x=4

b)6+|x|=2

=>6+x=2

x=2-6

x=-4