(5x+7y-2)(5x-7y+2)化简是什么?急
问题描述:
(5x+7y-2)(5x-7y+2)化简是什么?急
答
(5x+7y-2)(5x-7y+2)=(5x)²-(7y-2)²=25x²-49y²+28y-4
(5x+7y-2)(5x-7y+2)化简是什么?急
(5x+7y-2)(5x-7y+2)=(5x)²-(7y-2)²=25x²-49y²+28y-4