分解因式(x-1)²-9等于多少
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分解因式(x-1)²-9等于多少
分解因式(x-1)²-9等于多少
分解因式(x-1)²-9等于多少
(x-1)²-9
=(x-1+3)(x-1-3)
=(x+2)(x-4)
a^2-b^2= (a+b)(a-b)
(x-1)²-9
=(x-1)²-3²
=(x-1+3)(x-1-3)
=(x+2)(x-4)
(x-1)²-9
=(x-1+3)(x-1-3)
=(x+2)(x-4)
=[(x-1)+3][(x-1)-3]=(x+2)(x-4)
(x-1)²-9
=(x-1+3)(x-1-3)
=(x+2)(x-4)
。