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解
3a²-9ab
=3a(a-3b)
a^4-1
=(a²-1)(a²+1)
=(a-1)(a+1)(a²+1)
x²-y²-2y-1
=x²-(y²+2y+1)
=x²-(y+1)²
=(x-y-1)(x+y+1)
x²-3x+4
=(x-4)(x+1)
3a²-9ab
=3a(a-3b)
a^4-1
=(a²-1)(a²+1)
=(a-1)(a+1)(a²+1)
x²-y²-2y-1
=x²-(y²+2y+1)
=x²-(y+1)²
=(x-y-1)(x+y+1)
x²-3x+4
=(x-4)(x+1)
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