Respuesta:
(a+3)³ - a³+9a²+27a+27
(7/6x + 1/2m)² - 1/4m²+7/6mx+49/36x²
(-2/3a+7/3b)² - 4/9a²-28/9ab+49/9b²
(x+y)(x+y) - x²-y²
m²-n² - (m-n)(m+n)
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Respuesta:
(a+3)³ - a³+9a²+27a+27
(7/6x + 1/2m)² - 1/4m²+7/6mx+49/36x²
(-2/3a+7/3b)² - 4/9a²-28/9ab+49/9b²
(x+y)(x+y) - x²-y²
m²-n² - (m-n)(m+n)