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一樓正解
=x^4+2x^3+3x^2
+2x^3+4x^2+6x
+3x^2+6x+9
=(x^2+2x+3)^2
x4+4x3+10x2+12x+9 分解因式
x4+4x3+10x2+12x+9 分解因式
數(shù)學(xué)人氣：274 ℃時(shí)間：2020-10-01 21:29:48
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