Question

Rezolvati ex. 22,23,24.Ofer 30 puncte.Rog seriozitate!!

Answer 1

ex.22 a+b+c+d=106 a+b=c+d+10 a=b-4 d=c+8 a,b,c,d=? a+b=c+d+10 c+d+10+c+d=2c+2d+10=106 2c+2d=96 c+d=48 d=c+8 c+c+8=48 2c=40 c=20 20+d=48 d=28 a+b=58 a=b-4 b+b-4=58 2b=62 b=31 a=27 v:27+31+20+28=106 ex.23 a,b,c,d,e,... i)a=18 ii)a,a+7,a+2x7,...... a+9x7=? a+a+7+a+2x7+.....+a+19x7=? a+9x7=18+63=81] a+a+7+a+2x7+...+a+19x7=20a+[(19+18+17+.....1)x7]=20a+[19x10]x7=20a+190x7=20a+1330=20x18+1330=360+1330=1690 ex.24 a)x+1000≤1325 si x≥124 x≤325 x≥124 x={124,125,126,....,325} b)2137+x≤2514 si x+43≥57 x≤377 x≥14 x={14,15,16,....,377} c)(250-x)-130≥70 si x+50≥70 (250-x)-130=x+50 250-x≥200 x≥50 x+50≥70 x≥120 x={50,52,52,...,n,......}