Ответ:
Объяснение:
1км^2=1*10^10 см ^2
1м^2=1*10^4 см ^2
35,9*10^12 cм^2=35.9*10^8 м^2 (12-4)
35,9*10^12 cм^2=35,9*10^2 км^2 (12-10)
a8=a1+7d=60
a7/a1=a25/a7=q
a1=60-d
a7=60-d+6d=60+5d
a25=60-d+24d=60+23d
![\frac{60+5d}{60-d}=\frac{60+23d}{60+5d}](https://tex.z-dn.net/?f=%5Cfrac%7B60%2B5d%7D%7B60-d%7D%3D%5Cfrac%7B60%2B23d%7D%7B60%2B5d%7D)
![(60+5d)^{2}=(60+23d)(60-d)](https://tex.z-dn.net/?f=%2860%2B5d%29%5E%7B2%7D%3D%2860%2B23d%29%2860-d%29)
![3600+600d+25d^{2}=3600+1380d-60d-23d^{2}](https://tex.z-dn.net/?f=3600%2B600d%2B25d%5E%7B2%7D%3D3600%2B1380d-60d-23d%5E%7B2%7D)
![48d^{2}-720d=0](https://tex.z-dn.net/?f=48d%5E%7B2%7D-720d%3D0)
![d^{2}-15d=d(d-15)=0](https://tex.z-dn.net/?f=d%5E%7B2%7D-15d%3Dd%28d-15%29%3D0)
d не равно 0 по условию, значит d=15
a1=60-15=45
a7=60+5*15=60+75=135
q=a7/a1=135/45=3
Ответ: Надеюсь такое решение тебе подойдет)
Объяснение:
Π=180°
3π/10=3*180°/10=54°