Question

[Nguyen ngoc thao]

a, -a-(b-a-c)

b,-(a-c)-(a-b+c)

c,b-(b+a-c)

d,-(a-b+c)-(a+b+c)

GIÚP MÌNH NHA M.N

Answer 1

[phùng]

-a-(b-a-c) =-a-b+a+c =(-b)+c -(a-c)-(a-b+c) =-a-+c-a+b-c =b-2a b-(b+a-c) =[b+(-b)]-a+c =(-a-)+c -(a-b+c)-(a+b+c) =-a-+b-c-a-b-c =-2a -2c