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b)====
c)===2
d)====3²=3
e)====
f)=====2³=8
5,3a)·+·-·-·=-=2-5=-3
b)(3-√5)+2··+(3+√5)=(3-√5)+2·(·-·)+(3+√5)=(3-√5)+2·(3-)+(3+√5)=3-√5+6-(2·√5)+3+√5=12-2√5=2(6-√5)