2 1 x 7 1 y − 2 0 5x 2y 12 July 8, 2019 16 32 64 128 2) (5y ^ 2)/(1 - y ^ 2) / (1 - 1/(1 - y)) 2(1 5 − х) = 7 2) (1 2 7 y- 1 2 ) 2 5=5 2
