分解因式:x方-10xy+25y方-6x+30y+8

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分解因式:x方-10xy+25y方-6x+30y+8

分解因式:x方-10xy+25y方-6x+30y+8
分解因式:x方-10xy+25y方-6x+30y+8

分解因式:x方-10xy+25y方-6x+30y+8
x²-10xy+25y²-6x+30y+8
=(x-5y)²-6(x-5y)+8
=(x-5y-2)(x-5y-4)

x²-10xy+25y²-6x+30y+8
=(x²-10xy+25y²)-6(x-5y)+8
=(x-5y)²-6(x-5y)+8
设x-5y=t
=t²-6t+8
=(t-2)(t-4)
带入t得
=(x-5y-2)(x-5y-4)