Question

(m+n)-(m-n)=

(m+3)-(6m+5)-(m-1)=

(x-y)+(x-y)-(2x+y)=

Answer 1

(m+n)-(m-n)=m+n-m+n=2n

(m+3)-(6m+5)-(m-1)=m+3-6m-5-m+1=-6m-1

(x-y)+(x-y)-(2x+y)=x-y+x-y-2x-y=-3y

 

Answer 2

1)=m+n-m+n=2n

2)=m+3-6m-5-m+1=-6m-1

3)=x-y+x-y-2x-y=-3y