Odpowiedzi

2010-02-09T18:16:28+01:00
A+(a-b)=a+a-b=2a-b
2x-(x+4)=2x-x-4=x-4
7-(-x+6)=7+x-6=1+x
-(x+4)+(x-5)=-x-4+x-5=-9
1-(t+p)-(t-2)=1-t-p-t+2=3-2t-p
-(-y+2)+(-2y-4)= y-2-2y-4=-6-y