<span>k₂=1/2(m+n)</span>
<span>2(m+n)=1/k₂</span>
<span>m+n=1/2k₂</span>
<span>n=1/2k₂ -m</span>
График функции: у=2х-5,у=1,5х+2
1.а^2+18a+81+2a^2+18a=