分解因式;X²-6X+9-Y² (a²+b²-1)²-4a²b²
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X²-6X+9-Y²
=(x-3)^2-y^2
=(x-3+y)(x-3-y)
(a²+b²-1)²-4a²b²
=(a²+b²-1+2ab)(a²+b²-1-2ab)
=(a+b+1)(a+b-1)(a-b+1)(a-b-1)
=(x-3)^2-y^2
=(x-3+y)(x-3-y)
(a²+b²-1)²-4a²b²
=(a²+b²-1+2ab)(a²+b²-1-2ab)
=(a+b+1)(a+b-1)(a-b+1)(a-b-1)
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都是利用平方差公式的a²-b²=(a+b)(a-b)
X²-6X+9-Y²
=(X-3)²-Y²
=(X+Y-3)(X-Y-3)
(a²+b²-1)²-4a²b²
=(a²+b²-1-2ab)(a²+b²-1+2ab)
=[(a-b)²-1][(a+b)²-1]
=(a-b-1)(a-b+1)(a+b-1)(a+b+1)
X²-6X+9-Y²
=(X-3)²-Y²
=(X+Y-3)(X-Y-3)
(a²+b²-1)²-4a²b²
=(a²+b²-1-2ab)(a²+b²-1+2ab)
=[(a-b)²-1][(a+b)²-1]
=(a-b-1)(a-b+1)(a+b-1)(a+b+1)
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