matematykaszkolna.pl
uhih: 0= 25a -5b +c 0=a-b+c 2=9a-3b+c ktos trzasnie ukladzik?emotikonka
4 sty 21:24
Basia: 25a - 5b + c = 0 -a +b - c = 0 ---------------------- 24a -4b =0 /:4 6a-b =0 9a - 3b + c = 2 -a + b - c = 0 --------------------- 8a -2b =2 /:2 4a - b = 1 6a - b = 0 -4a +b = -1 ------------------- 2a = -1 a= -1/2 4(-1/2) - b =1 -2 -b = -1 -b = 1 b= -1 -1/2 + 1 +c = 0 1/2 +c =0 c= - 1/2
4 sty 22:03