1) esli a8=8 a15=-27 togda... ispolzuvaem formula An=An+(n-k)d. i poluchim otvet 43
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1)
А)углы 7,4; 5,6
Б) углы 7,6;5,4;1,8;2,4
В) углы 4 и 1, 6 и 3
Г) 3,7; 1,5
(3^11*3^3)/(3^2)^6= (3^11+3)/3^12=3^14/3^12= 3^14-12= 3^2=9
<span>log2(5+3log2(x-3))=3
5+3log2(x-3)=2</span>³
5+3log2(x-3)=8
3log2(x-3)=8-5
3log2(x-3)=3
log2(x-3)=1
x-3=2
x=2+3
x=5