a+b=5 এবং a-b=3 হলে ab এর মান কত?
| October 14, 2016 | গাণিতিক যুক্তি, 10 BCS Preliminary
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[latex]ab=(\frac{a+b}{2})^2-(\frac{a-b}{2})^2 = (\frac{5}{2})^2-(\frac{3}{2})^2 = 4[/latex]
[latex]ab=(\frac{a+b}{2})^2-(\frac{a-b}{2})^2 = (\frac{5}{2})^2-(\frac{3}{2})^2 = 4[/latex]
