(х-6)(-5х-9)=0
-5х^2-9х+30х-54=0
-5х^2-39х-54=0 \:-1
5х^2+39х+54=0
D=39^2-4·54·5=1521-1080=корень из 441=21
х1=39-41/2·5=-2/10=-0,2
х2=39+41/2·5=80/10=8
-0,2<8
ответ: -0,2
1.<em><span>300</span></em><em><span>х</span></em><span /><span><span> </span></span>
<span>2.</span><em><span>300</span></em><em><span>х</span></em><span /><span><span> </span>+ 10</span>
<span>3.</span><em><span>(</span></em><em><span>300</span></em><em><span>х</span></em><span /><span><span> </span>+ 10) – 1</span>
<span>Вроде так решается, не уверна.</span>
<span>2+3(y-1/3)-2(0.5y)</span>