Odpowiedzi

2010-03-02T09:14:50+01:00
2a + (3a -7)= 2a + 3a -7 = 5a -7
x- (2x -3) = x - 2x + 3 = -x + 3

2010-03-02T09:20:12+01:00
2a+(3a-7) x-(2x-3)=
2a+3a-7+x-2x+3=
5a-4-x