(x-y)二次方-49(x+y)二次方,分解因式

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(x-y)二次方-49(x+y)二次方,分解因式
(x-y)二次方-49(x+y)二次方,分解因式

(x-y)二次方-49(x+y)二次方,分解因式
(x-y)二次方-49(x+y)二次方
=(x-y)二次方-【7(x+y)】二次方
=[(x-y)+7(x+y)][(x-y)-7(x+y)]
=(8x+6y)(-6x-8y)
= -4(4x+3y)(3x+4y)

原式=(x-y+7x+7y)(x-y-7x-7y)
=(8x+6y)(-6x-8y)
=-4(4x+3y)(3x+4y)

(x-y)二次方-49(x+y)二次方
=[(x-y)+7(x+y)][(x-y)-7(x+y)]
=(x-y+7x+7y)(x-y-7x-7y)
=(8x+6y)(-6x-8y)
=-4(4x+3y)(3x+4y)

望采纳~~~