πr²/πR²=1/9
r²<span>/ R</span>²<span> =1/9</span>
r <span>= √ R</span>²<span>/9 = R/3 = 9/3 =3 дм</span>
(6.97Х-13,2Х)*(- 1 11/89)=-5 2/9 - 3 1/3
-6,23х*(-100/89)=-47/9-30/9
623х/89=-77/9
9*623х=-77*89
5607х=-6853
х=-6853/5607=-1 1246/5607
Решение на фото//////////