zapisz jak najprościej.
f)1/2a(a+1)-2()a2/4-a/2
[jedna druga(a+1)-2("a" do gory do kwadratu a na dole 4 - "a "do gory na dole 2)]
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1/2a(a + 1) -2(a²/4 - a/2)=
= 1/2a² + 1/2a - 1/2a² + a =
= 3/2a = 1 i 1/2a