Oblicz cztery początkowe wyrazy ciągu; an=(-1)do n *2-n/2n dziękuje
a1=(-1)^1 * 2-1/2*1 = -1 * 1/2=-1/2
a2=(-1)^2* 2-2/2*2=1 * 0/4=0
a3=(-1)^3 * 2-3/2*3 = -1 * (-1)/6=1/6
a4=(-1)^4 * 2-4/2*4 = 1 * (-2)/8 = -1/4
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a1=(-1)^1 * 2-1/2*1 = -1 * 1/2=-1/2
a2=(-1)^2* 2-2/2*2=1 * 0/4=0
a3=(-1)^3 * 2-3/2*3 = -1 * (-1)/6=1/6
a4=(-1)^4 * 2-4/2*4 = 1 * (-2)/8 = -1/4