<span><span><span><span><span><span>A</span><span>B</span><span>=</span><span>A</span><span>C</span><span>c</span><span>o</span><span>s</span><span><span><span><span>30</span></span><span><span>0</span></span></span></span><span>=</span><span><span><span><span><span>3</span></span></span><span><span>√</span></span></span></span><span><span><span>/</span></span></span><span>2</span><span>,</span><span>B</span><span>C</span><span>=</span><span>A</span><span>C</span><span>s</span><span>i</span><span>n</span><span><span><span><span>30</span></span><span><span>0</span></span></span></span><span>=</span><span>1</span><span><span><span>/</span></span></span><span>2</span><span>,</span><span>B</span><span>D</span><span>=</span><span><span><span><span><span>A</span><span>B</span><span>⋅</span><span>B</span><span>C</span></span></span><span><span><span>A</span><span>C</span></span></span></span></span><span>=</span><span><span><span><span><span>3</span></span></span><span><span>√</span></span></span></span><span><span><span>/</span></span></span><span>4</span></span></span></span></span></span>
Пусть х - второе число.
х+ 11/9х=60
х=60:20/9
х=27 - 1 число, тогда
27*11/9=33 - второе число.
33*27=891
Ответ: 891.
Узнаем сколько м^3 он выкапывает за 1
108/3=36
теперь за 6 часов
36*6=216
-5×-28/15=-28/3=-8и4/3
3-1.5×(-1/3)=3-15/10×(-1/3)=3-(-1/2)=3/2
дальше не могу прости.
