Question

Ada yang bisa soal nomor 23?

Answer 1

R = u2/u1 = u3/u2
r = (a-1)/(a+1) = (a-2)/(a-1)
     (a-1)(a-1) = (a+1)(a-2)
      a²-2a+1  =  a²-a-2
   a²-a²-2a+a = -2-1
               -a = -3
               a = 3
r = (a-1)/(a+1)
  = (3-1)/(3+1)
  = 2/4
  = 1/2