1) (1-5/3)²·3/2 aducem paranteza la acelasi numitor
=(-2/3)²·3/2=4/12·3/2 simplificam=1/2
2.a=5-2√6
b=2+2√6
Mg=√a·b=√(5-2√6)(5+2√6)=√25+10√6-10√6-24=√25-24=√1=1
4. calculam media ponderata
Mp=(tunu·Izi+tdoi·II zi+ttrei·III zi+tpatru·IV zi+...)/I zi+II zi+III zi+IV zi+....