数学10道因式分解题题随便如题-查字典问答网
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  数学10道因式分解题题随便如题

  数学10道因式分解题题随便如题

1回答
2020-05-11 21:43
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黄效国

  (1)6x4y2-12x3y+27x2y3

  =3x2y·2x2y-3x2y·4x+3x2y·9y2=3x2y(2x2y-4x+9y2)

  (2)-x4y+x3y2-x2y3=-(x4y-x3y2+x2y3)

  =-(x2y·x2-x2y·xy+x2y·y2)

  =-x2y(x2-xy+y2)

  (3)xn+3xn-1+xn-2=xn-2·x2+xn-2·3x+xn-2·1

  =xn-2(x2+3x+1)

  (4)5(x-y)3+10(y-x)2=5(x-y)3+10(x-y)2

  =5(x-y)2(x-y+2)

  (5)m(5ax+ay-1)-m(3ax-ay-1)

  =m[(5ax+ay-1)-(3ax-ay-1)]

  =m·(5ax+ay-1-3ax+ay+1)

  =m(2ax+2ay)=2ma(x+y)

  (6)x2+14x+49=x2+2·x·7+72

  =(x+7)2

  (7)(m+n)2-6(m+n)+9=(m+n-3)2

  (8)-3ax2+6axy-3ay2=-3a(x2-2xy+y2)

  =-3a(x-y)2

  (9)(x2+4)2+8x(x2+4)+16x2

  =(x2+4)2+2·(x2+4)·4x+(4x)2

  =(x2+4+4x)2

  =(x+2)4

  (10)64m2n2-(m2+16n2)2

  =(8mn)2-(m2+16n2)2

  =(8mn+m2+16n2)(8mn-m2-16n2)

  =(m+4n)2[-(m-4n)2]

  =-(m+4n)2(m-4n)2

2020-05-11 21:44:47

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