-25x^2y^2+49

-25x^2y^2+49,过程
2025-12-25 09:07:27
推荐回答(1个)
回答1:

-25x^2y^2+49
=-(5xy)^2+49
=49-(5xy)^2
=7^2-(5xy)^2
=(7-5xy)(7+5xy)