Вправа 487 алгебра Бевз гдз 7 клас
$$\begin{aligned}
&\text { № } 487\\
&\begin{aligned}
& \text { a) } x^2+10 x+25=0 \\
& (x+5)^2=0 \\
& x=-5
\end{aligned}\\
&\begin{aligned}
& \text { 6) } 25 x^2-30 x+9=0 \\
& (5 x-3)^2=0 \\
& 5 x-3=0 \\
& x=\frac{3}{5}
\end{aligned}\\
&\begin{aligned}
& \text { в) } 1-8 x+16 x^2=0 \\
& (1-4 x)^2=0 \\
& 1-4 x=0 \\
& -4 x=-1 \\
& x=\frac{1}{4}
\end{aligned}\\
&\begin{aligned}
& \text { г) } 36+12 x+x^2=0 \\
& (6+x)^2=0 \\
& x=-6
\end{aligned}
\end{aligned}
$$
вправи поруч
