因式分解 1 ;y²‐y‐20 2; x²﹢5xy﹢4² 3: a²b²‐8ab﹢7
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因式分解 1 ;y²‐y‐20 2; x²﹢5xy﹢4² 3: a²b²‐8ab﹢7
因式分解 1 ;y²‐y‐20 2; x²﹢5xy﹢4² 3: a²b²‐8ab﹢7
因式分解 1 ;y²‐y‐20 2; x²﹢5xy﹢4² 3: a²b²‐8ab﹢7
1(y+4)(y-5)
2+4y^2吧 (x+y)(x+4y)
3(ab-1)(ab-7)
1 ;y²‐y‐20
=(y-5)(y+4)
2; x²﹢5xy﹢4y²
=(x+y)(x+4y)
3: a²b²‐8ab﹢7
=(ab-1)(ab-7)
(Y-5)*(Y+4) 2不会 (AB-1)*(AB-7)