হলে ab+bc+ca -এর মান কত ?
Created: 5 years ago |
Updated: 3 years ago
best des
a + b + c = 9,
a² + b² + c² = 29,
ab + bc + ca = ?
(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)
বা, ab + bc + ca = {(a + b + c)² - (a² + b² + c² )}/2
= (81 - 29) / 2
= 26
Md Azizur Rahman
Founder of Satt
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