1) <span>f(x)= -0.2x + 5</span>
<span><span>-0.2x + 5=0</span></span>
<span><span>-0.2x=-5</span></span>
<span><span>х=25</span></span>
<span><span>2)<span>f(x)= 5x - 6x + 1</span></span></span>
<span><span><span><span>5x - 6x + 1=0</span></span></span></span>
<span><span><span><span>-х=-1</span></span></span></span>
<span><span><span><span>х=1</span></span></span></span>
<span><span><span><span>3)<span> f(x)= кореньиз(3-x)</span></span></span></span></span>
<span><span><span><span><span>кореньиз(3-x)=0</span></span></span></span></span>
<span><span><span><span><span>3-х=0</span></span></span></span></span>
<span><span><span><span><span>х=3</span></span></span></span></span>