Odpowiedzi

2010-01-06T23:56:10+01:00
Niech
u = l/m
l = cos²30⁰ + 3 tg 30⁰*ctg 60⁰ = (√3/2)² +3*(√3/3)*(√3/3) =
= 3/4 + [3*3]/[3*3] = 1 + 3/4 = 7/4
m = 1 - 8 ctg 45⁰ = 1 - 8*1 = 1 -8 = -7
u = l/m = (7/4)/(-7) = - 1/4
Odp. - 1/4
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