怎么简算(3x-5)^2(3x+5)^2

问题描述:

怎么简算(3x-5)^2(3x+5)^2

(3x-5)^2(3x+5)^2
=[(3x-5)(3x+5)]^2
=(9x^2-25)^2
=81x^4-450x^2+625