ঘন বিষয়ক সূত্র - bdjobbooks

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গাণিতিক সকল সূত্র

ঘন বিষয়ক সূত্র

  1. (a + b)3 = a3 + 3a2b + 3ab2 + b3 = a3 + b3 + 3ab (a + b)
  2. (a – b)3 = a3– 3a2b + 3ab2 – b3 = a3 – b3– 3ab (a – b)
  3. a3 + b3  = (a + b)(a2 – ab + b2) = (a + b)3– 3ab (a + b)
  4. a3– b3  = (a – b) (a2 + ab + b2) = (a – b)3 + 3ab (a – b)
  5. a3 + b3 + c3 – 3abc = (a + b + c) {(a – b)2 +(b − c)2 + (c – a)2}                                                                     অথবা    = (a + b + c) (a2 + b2 + c2 – ab – bc – ca)
  6. a3(b – c) + b3 (c – a) + c3 (a – b) = – (a – b) (b – c) (c – a) (a + b + c)