1
45√3=a√3
a=45 cm
Al=P×h=4×6×6=144 cm²
At=6×6×6=216 cm²
2.
(2×10+3×11+4×12+2×13+1×14)/(2+3+4+2+1)=
=(20+33+48+26+14)/12=141/12=11,75 ani adica 11 ani si 9 luni
3.
a=elevi in clasa A
b=elevi in clasa B
a+b=46 a=46-b
b-5+6= a+5
b+1=46-b+5
2b=50
b=25
a=46-25=21