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X ^ 4-Y ^ 4 - (XY)(X + Y)^ 3
=(XY)(X + Y)(X 2 + Y 2) - (XY)(X + Y)(X + y)的2
=(xy)的(+ y)的[(×2 + Y 2) - (X + y)的2]
=(xy)的(+ y)的(-2XY) BR /> = 2XY(XY)(X + Y)
=(XY)(X + Y)(X 2 + Y 2) - (XY)(X + Y)(X + y)的2
=(xy)的(+ y)的[(×2 + Y 2) - (X + y)的2]
=(xy)的(+ y)的(-2XY) BR /> = 2XY(XY)(X + Y)
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