<span>V=пr2h</span>
<span><span>h= <u>V </u></span></span>
<span><span> пr2</span></span>
<span><span>
</span></span>
<span><span>б) <span>(-6х+1,2):(-1/5)=-2х-6 16/25</span></span></span>
<span><span><span>-6х+1,2=-1/5(-2х-6 16/25)</span></span></span>
<span><span><span>-6х+1,2=0,4х+166/125</span></span></span>
<span><span><span>-6х-0,4х=166/125-1,2</span></span></span>
<span><span><span>-6,4х=16/125</span></span></span>
<span><span><span>х=16/125:-6,4</span></span></span>
<span><span><span>х=-1/50=-0,02</span></span></span>
<span><span><span>проверка:</span></span></span>
<span><span><span>-6,6=-6,6</span></span></span>