z.1 odp. D
z.2
D) x =-2 ,bo
x-10/x+8 =x+8/x-1 dla x = -2
6/-3 = -12/6
z.3
2 * 3^2 -6^2 = 2*9 - 36 = 18 - 36 = -18
z.4
a1 = -17, r = 4
a20 =a1 +(20-1)*r = -17 + 19 *4 =-17 +76 = 76 -17 =59
z.5
B) an = 8*9^n
a1 =8*9 =72
a2=8*9*9
a3 = 8*9*9*9
a3 :a2 =9 oraz a2 :a1 = 9
a1 = 72 , a iloraz q = 9
z.7
a1 =1/16 oraz a2 =-2
q =a2 :a1 = -2 :(1/16) = -2 *(16/1) = -2*16 = -32
z.9
log7(2) -log7(98) = log7(2/98) =log7(1/49) =-2 , bo
7^(-2) = 1/ (7^2) = 1/49