(2/3x - 5y)2 o dois no fim significa ao quadrado
vc faria destributiva (chuveirinho)
4/6. 2x-10y
(2/3x - 5y)^2 = ( 2 x )^2 + 2.( 2 x ).(-5y) + (-5y)^2 => 4x^2 - 20x + 25y^2
3 3 9 3
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vc faria destributiva (chuveirinho)
4/6. 2x-10y
(2/3x - 5y)^2 = ( 2 x )^2 + 2.( 2 x ).(-5y) + (-5y)^2 => 4x^2 - 20x + 25y^2
3 3 9 3