Question

Bỏ dấu ngoặc:

a/ ( b - c ) + ( a - b )

b/ ( a + b ) - ( c + a )

Answer 1

\(a,\left(b-c\right)+\left(a-b\right)=b-c+a-b=a-c\)

\(b,\left(a+b\right)-\left(c+a\right)=a+b-c-a=b-c\)

~ ủng hộ nha ~

Answer 2

a/ (b-c)+(a-b)=b-c+a-b=a+c

b/(a+b)-(c-a)=a+b-c-a=b-c

Answer 3

a) =b-c+a-b=-c+a

b)a+b-c-a=b-c

chúc bạn học giỏi

^_^ !