October 2021 0 9 Report
Відомо, що а2 + b2 + с2 = ЗО і а - Ь - с = 4. Доведіть, що

bс - аb - ас = -7 .​
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ch pomogite pozhalujstaa18da2e4f6a6f9769a3b43bf1efc61d9 48354
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