(3x+5y)²-(5x-3y)²
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(3x+5y)²-(5x-3y)²(3x+5y)²-(5x-3y)²(3x+5y)²-(5x-3y)²(3x+5y)²-(5x-3
(3x+5y)²-(5x-3y)²
(3x+5y)²-(5x-3y)²
(3x+5y)²-(5x-3y)²
(3x+5y)²-(5x-3y)²
=[(3x+5y)+(5x-3y)][(3x+5y)-(5x-3y)]
=(8x+2y)(-2x+8y)
=-8(4x+y)(x-4y)
(3x+5y)²-(5x-3y)²
=(3x+5y+5x-3y)（3x+5y-5x+3y)
=（8x+2y)(-2x+8y)
=4(4x+y)(4y-x)