<span>√(54/125</span><span><span>) = <span>√(6*9/5*25</span><span><span>) = </span></span><span>3/5 √(6/5</span><span><span>) </span></span>
</span></span>
<span>√(248/128</span><span><span>) = <span>√(124/64</span><span><span>) = </span></span><span><span><span>√(31/16</span><span><span>) = </span></span></span></span>1/4 <span><span><span>√(31</span><span><span>) </span></span></span></span>
</span></span>
<span>√(13/32</span><span><span>) = <span>√(13/2*16</span><span><span>) = </span></span><span>1/4 √(13/2</span><span><span>)</span></span>
</span></span>
<span>√(17/81</span><span><span>) = 1/9 <span>√(17</span><span><span>) </span></span>
</span></span>
сначала формула <span>(x в квадрате-9) это равняется как (x в квадрате - 3 в квадрате), раскрываем формулу - получается (x+3)(x-3) в итоге:</span>
<span>(x+3)(x-3)/(x+3)</span>
<span>(х+3) - сокращается, и остается просто х-3</span>
<span>
</span>