<span>X*x*x=x³
k*k=k²
</span>(7-n)(7-n) =<span>(7-n)²;ї
</span><span>(x+1)(x+1)(x+1)</span> = (х+1)³;
360:4=90 порций продал до обеда
360-90=270 порций осталось
270:3=90 порций после обеда
90+90=180 порций продали всего
360-180=180 осталось
Количество проданного и оставшегося мороженого равно
2×12=24 км прошла сначала за 2 часа.
18×1=18 км прошла баржа за 1 час.
(24+18)÷(2+1)=14 км/ч средняя скорость баржи.
Ответ: 14 км/ч.
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