(3x+5y)²-(5x-3y)²
问题描述:
(3x+5y)²-(5x-3y)²
答
(3x+5y)²-(5x-3y)²
=(3x+5y+5x-3y)(3x+5y-5x+3y)
=(8x+2y)(-2x+8y)
=4(4x+y)(4y-x)
答
(3x+5y)²-(5x-3y)²
=[(3x+5y)+(5x-3y)][(3x+5y)-(5x-3y)]
=(8x+2y)(-2x+8y)
=-8(4x+y)(x-4y)