(7x2+2y2)2-(2x2+7y2)2 因式分解.
问题描述:
(7x2+2y2)2-(2x2+7y2)2 因式分解.
答
(7x2+2y2)2-(2x2+7y2)2
=(7x²+2y²+2x²+7y²)(7x²+2y²-2x²-7y²)
=(9x²+9y²)(5x²-5y²)
=45(x²+y²)(x-y)(x+y)