Question

$(1.5x - 2y) {}^{2} + (2x + 1.5y) {}^{2} = 6.25(4a {}^{2} + 3b {}^{2} )$

Answer 1

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Answer 2

полагаю, необходимо доказать тождество

$\mathtt{(1,5x-2y)^2+(2x+1,5y)^2=}\\\mathtt{=2,25x^2-6xy+4y^2+4x^2+6xy+2,25y^2=6,25x^2+6,25y^2=}\\\mathtt{6,25(x^2+y^2)}$

чтд