原式=x²-9x+3x-27
=x(x-9)+3(x-9)
=(x-9)(x+3)
原式=a²+3ab+5ab+15b²
=a(a+3b)+5b(a+3b)
=(a+3b)(a+5b)
因式分解 x²-6x-27 a²+8ab+15b²
因式分解 x²-6x-27 a²+8ab+15b²
數(shù)學(xué)人氣：350 ℃時(shí)間：2020-03-28 17:17:37
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