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mursalovasuriya

frac{4}{9} {a}^{2} - 2ab + frac{9}{4} {b}^{2} = \ = { (frac{2}{3} a)}^{2} - 2 times frac{2}{3} a times frac{3}{2} b + ( { frac{3}{2} b)}^{2} = \ = {( frac{2}{ 3} a - frac{3}{2}b) }^{2}

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