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(2x-y)^3-(x-2y)^3-(x+y)^3=[(2x-y)^3-(x-2y)^3]-(x+y)^3=(2x-y-x+2y)[(2x-y)²;+(2x-y)(x-2y)+(x-2y)²;]-(x+y)^3=(x+y)(7x²;-13xy+7y²;)-(x+y)³;=(x+y)[(7x²;-13xy+7y…
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