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a) 0,(4) + 1,(35) = 0,44444... + 1,353535353535... = 1,7979797 ... = 1,(79)
179,79797979 ... = 100x
1,79797979... = x (odejmuję stronami)
178 = 99x / :99
x = 178/99
b) 9!/ 6!×5! = 6! * 7*8*9 /6! * 5! = 7*8*9/2*3*4*5 = 3/5 = 0,6
c) (18/15) = 6/5 = 1,2
d) NWD (108,1944)
108 = 2² * 3³
1944 = 2³ * 3^5
NWD (108,1944) = 2² * 3³ = 108