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2(1+x)=5+x
2+2x=5+x
2x-x=5-2
x=3
należy do mianownika i licznika dodać liczbę 3
10.dane:Pb=12√3
Pb=3*a²√3/4
12√3=3√3/4/:3√3/4
12√3*4/3√3=a²
16=a² a=4cm
V=a³√2/12
V=4³√2/12
V=64√2/12
V=16√2/3 cm³