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978 . a2 + b2 - c2 +2aba2 - b2 + c2 +2ac = কত?

  • A. a +b + c
  • B. a + b - ca - b + c
  • C. a - b + ca + b - c
  • D. a + b - ca + b + c
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979 . a2 - x2a + y × a2 - y2ax + x2 × 1a - x = কত?

  • A. a + yx
  • B. a - yx
  • C. x + ay
  • D. x - ya
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980 . 12(1x-1 - 1x+1) - 1x2 + 1 = কত?

  • A. 2x4 + 1
  • B. 2x2x4 - 1
  • C. 2x2x4 + 1
  • D. 2x4 - 1
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982 . a3 + b3 = কত?

  • A. a3 + 3a2b + 3ab2 + b3
  • B. (a + b)3 + 3ab(a + b)
  • C. (a + b)3 - 3ab(a + b)
  • D. (a + b)(a2 + ab + b2)
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983 . (a - 2b)3- এর মান কত?

  • A. a3 - 8b3 - 6a2b + 12ab2
  • B. a3 + 8b3 + 6a2b + 12ab2
  • C. a3 + 8b3 - 12ab
  • D. a3 -8b3 - 12a2b - 6ab3
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984 . (x - 1)(x2 + x + 1)- এর গুণফল কত হবে?

  • A. x3 - 3
  • B. (x - 1)3
  • C. x3 - 1
  • D. x3 + 4x2 +1
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