计算(-5x+4y)(5x-4y)最好有步骤_数学解答

计算(-5x+4y)(5x-4y)最好有步骤

人气：214 ℃　时间：2020-04-10 20:53:29

解答

(-5x+4y)(5x-4y)
=[-(5x-4y)](5x-4y)
=-(5x-4y)^2
=-(25x^2-40xy+16y^2)
=-25x^2+40xy-16y^2