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Q: If (\(4a ^2\)-\(3b^2\)):(\(2a ^2\)+\(5b ^2\))=12:19, then a:b=___

  • 1
    2:3
  • 2
    1:2
  • 3
    3:2
  • 4
    2:1
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Answer : 3. "3:2"

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