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1247 . ax2 + bx + c = 0 সমীকরণের মূল দুইটি মূলদ হবে যদি--

  • A. b2 > 4ac
  • B. b2 - 4ac একটি পূর্ণবর্গ সংখ্যা হয়
  • C. b2 < 4ac
  • D. কোনটিই নয়
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1250 . (x - 2)2 = 0 হলে x এর মান কত?

  • A. 5
  • B. 5.5
  • C. 6
  • D. কোনটিই নয়
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1259 . x - y = 3 এবং x + y = 6, ইহা একটি--

  • A. সরল সমীকরণ
  • B. সহ-সমীকরণ
  • C. জোড়া সমীকরণ
  • D. দ্বিঘাত সমীকরণ
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