2(7.3-1.6а)+3.2а-9.6=14.6-3.2а+3.2а-9.6=14.6-9.6=5
Б) a^2+1-6a+4
a^2-6a+5
D=36-4*1*5=16
<span>√D=8
x1= 6+8/2=7
x2=6-8/2=-1</span>
Log₂log₃log₄ (4⁹) = log₂log₃ 9 = log₂log₃ 3² = log₂2 = 1
<span>1)x^4-16z^4=(х^2-4z^2)(x^2+4z^2)
</span><span>2)81-k^4=(9-k^2)(9+k^2)</span>
Вот,короче так..
удачи! ;)