Odpowiedzi

2010-02-16T22:30:28+01:00
A) a+(a-b) = a+a-b = 2a-b
b) 2x-(x+4) = 2x-x-4 = x-4
c) 7-(-x+6) = 7+x-6 = 1+x
d) -(x+4)+(x-5) = -x-4+x-5 = -9
e) 1-(t+p)-(t-2) = 1-t-p-t+2 = 3-2t-p
f) -(-y+2)+(-2y-4) = y-2-2y-4 = -y-6