(5X+3)平方乘以(3-5X)平方

问题描述:

(5X+3)平方乘以(3-5X)平方

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