14600

494362

\(\dfrac{1}{2}+\dfrac{3}{8}.\dfrac{4}{5}-=\dfrac{4}{5}\)

\(\dfrac{1}{2}+\sqrt{3}-(\dfrac{1}{2}+\sqrt{3})=2\sqrt{3}\)

x=\(\dfrac{32.(-7)}{-28}\)=8

C3H7(OH) + 9/2 O2 --->3CO2   +4H2O

   0,1              0,45                            0,4

--->VO2=0,45.22,4=10,08l

mH2O=0,4.18=7,2g

C

x.\(\dfrac{3}{4}\)=\(\dfrac{5}{2}\):\(\dfrac{2}{3}\)

-->x=\(\dfrac{5.3.4}{2.2.3}\)=5

2(x-3) +\(\dfrac{x-3}{2}\)=0 -->4x-12+x-3=0 --->x=3

Sxq=2.3.4+2.4.5+2.3.5=94 cm^2