September 2018 1 33 Report

proszę o pomoc

sprowadz do najprostrzej postaci wyrażenia:

a) (a+3b)^2-(a-3b)^2

b) 2n(n-5)-(n-k)(n+k)-5n(2/5k-20

c)
d) e) z góry dziękuję:)
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