10道因式分解1.-7m(m-n)^3+21mn(n-m)^-查字典问答网
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来自李钟华的问题

  10道因式分解1.-7m(m-n)^3+21mn(n-m)^22.5x(x-2y)^2-10y(2y-x)^23.225(x-y)^2-196(x+y)^24.(5x-3y)^2-(3x-5y)^25.(5m^2+8n^2)^2-(4m^2+n^2)^26.x^3+x^2y-xy^2-y^37.9m^2-15m+4分之258.(a^2-1)^2+6(1-a^2)+99.a^2-9b^2+6b-110.mn^2-2mn+2n-4

  10道因式分解

  1.-7m(m-n)^3+21mn(n-m)^2

  2.5x(x-2y)^2-10y(2y-x)^2

  3.225(x-y)^2-196(x+y)^2

  4.(5x-3y)^2-(3x-5y)^2

  5.(5m^2+8n^2)^2-(4m^2+n^2)^2

  6.x^3+x^2y-xy^2-y^3

  7.9m^2-15m+4分之25

  8.(a^2-1)^2+6(1-a^2)+9

  9.a^2-9b^2+6b-1

  10.mn^2-2mn+2n-4

1回答
2020-05-11 20:46
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郭艳华

  1.-7m(m-n)^3+21mn(n-m)^2

  =-7m(m-n)^3+21mn(m-n)^2

  =-7m(m-n)^2[(m-n)-3n]

  =-7m(m-n)^2(m-4n)

  2.5x(x-2y)^2-10y(2y-x)^2

  =5x(x-2y)^2-10y(x-2y)^2

  =5(x-2y)^3(x-2y)

  3.225(x-y)^2-196(x+y)^2

  =[15(x-y)]²-[14(x+y)^2

  =[15(x-y)+14(x+y)][15(x-y)-14(x+y)]

  =(15x-15y+14x+14y)(15x-15y-14x-14y)

  =(29x-y)(x-29y)

  4.(5x-3y)^2-(3x-5y)^2

  =[(5x-3y)+(3x-5y)][(5x-3y)-(3x-5y)]

  =(8x-8y)(2x+2y)

  =16(x-y)(x+y)

  5.(5m^2+8n^2)^2-(4m^2+n^2)^2

  =(5m^2+8n^2+4m^2+n^2)(5m^2+8n^2-4m^2-4n^2)

  =(9m^2+9n^2)(m^2+4n^2)

  =9(m^2+n^2)(m^2+4n^2)

  6.x^3+x^2y-xy^2-y^3

  =(x^3+x^2y)-(xy^2+y^3)

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

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

  =(x+y)(x+y)(x-y)

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

  7.9m^2-15m+4分之25

  =(3m)^2-15m+(5/2)^2

  =(3m-5/2)^2

  8.(a^2-1)^2+6(1-a^2)+9

  =(a^2-1)^2-6(a^2-1)+9

  =(a^2-1-3)^2

  =(a^2-4)^2

  =(a+2)^2(a-2)^2

  9.a^2-9b^2+6b-1

  =a^2-(9b^2-6b+1)

  =a^2-(3b-1)^2

  =(a+3b-1)(a-3b+1)

  10.mn^2-2mn+2n-4

  =(mn^2-2mn)+(2n-4)

  =mn(n-2)+2(n-2)

  =(n-2)(mn+2)

2020-05-11 20:49:18

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