3.
D:I=C
1412 SUPRA 25 :x=89supra15
x=1412supra25:89supra15
x=1412supra25 ori 15supra89
x=2118supra2225
4.
[tex][( \frac{1}{15} - \frac{1}{18} ): \frac{1}{45} + \frac{1}{60} :( \frac{1}{12} - \frac{1}{15} )]: \frac{3}{2} =
\frac{18-15}{270} *45+ \frac{1}{60} :( \frac{5-4}{60} * \frac{2}{3} =
[/tex]
3pe+1pe 60 ori60ori2pe3
3pe6+2pe3
7pe6=1.16E N