лити?
<em><span>Умова:</span></em><span>Все</span><span> </span><span>поле -</span><span> </span><span>х</span><span>Олег</span><span> </span><span>полив</span><span> </span><span>-1/2х</span><span>Саша -</span><span> </span><span>1/5x</span><em><span>Рішення:</span></em><span>1</span><span>/</span><span>5</span><span> </span><span>+1 /</span><span> </span><span>2</span><span> </span><span>=</span><span> </span><span>2</span><span>/</span><span>10</span><span> </span><span>+5 /</span><span> </span><span>10</span><span> </span><span>=</span><span> </span><span>7</span><span>/</span><span>10</span><span> </span><span>=</span><span> </span><span>0.7</span><span> </span><span>(</span><span>с.)</span><em><span>Відповідь</span></em><span><em>:</em> разом</span><span> </span><span>вони</span><span> </span><span>полили</span><span> </span><span>0.7</span><span> </span><span>саду.</span>