1) <span>y(в квадрате)=y</span>
<span> у^2-y=0</span>
<span> y(y-1)=0</span>
<span> y=0 или у-1=0</span>
<span> у=1</span>
<span>Ответ: у=0</span>
<span> у=1</span>
<span>2) <span> a(в кубе)=a</span></span>
<span><span> a^3-a=a(a-1)(a+1)</span></span>
<span><span> a=0 или а-1=0 или а+1=0</span></span>
<span><span> а=1 а=-1</span></span>
<span><span>Ответ: a=0</span></span>
<span><span> а=1</span></span>
<span><span> а=-1</span></span>
<span><span>3) <span>x(в квадрате)=4x </span></span></span>
<span><span><span> х^2-4x=0</span></span></span>
<span><span><span> x(x-4)=0</span></span></span>
<span><span><span> x=0 или х-4=0</span></span></span>
<span><span><span> х=-4</span></span></span>
<span><span><span>Ответ: х=0</span></span></span>
<span><span><span> х=-4</span></span></span>
<span><span><span>4) <span>t(в квадрате)=-5t</span></span></span></span>
<span><span><span><span> t^2+5t=0</span></span></span></span>
<span><span><span><span> t(t+5)=0</span></span></span></span>
<span><span><span><span> t=0 или t+5=0</span></span></span></span>
<span><span><span><span> t=-5</span></span></span></span>
<span><span><span><span>Ответ: t=0</span></span></span></span>
<span><span><span><span> t=-5</span></span></span></span>