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2014-08-21T16:46:32+03:00
A) -3-2-1+0+1+2+3+4....+25=   4+5+6+...+25

=(4+25)*20/2= 29*10= 290

b) |2z-1|=3

2z-1= 3    2z-1 = -3
2z= 4         2z = -2
z= 2            z= -1
2 5 2