用乘法公式分解因式1.1/2a^2-2ab+2b^22.2x-查字典问答网
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来自齐金平的问题

  用乘法公式分解因式1.1/2a^2-2ab+2b^22.2x^3y+8x^2y^2+8xy^33.-9x^2-3xy-1/4y^24.(x^2-x)^2+6(x^2-x)+95.(x^2-2x)^2+2x(x-2)+16.9a^2-30ab^2+25b^47.-4x^2+12xy-9y^28.9(2a-b)^2-6(2a-b)+19.-2m^3+24m^2-72m10.-x^4+2x^2y^2-y^411.(x+y)^2+4(x-y)^2-4(x^2-y^2)

  用乘法公式分解因式

  1.1/2a^2-2ab+2b^2

  2.2x^3y+8x^2y^2+8xy^3

  3.-9x^2-3xy-1/4y^2

  4.(x^2-x)^2+6(x^2-x)+9

  5.(x^2-2x)^2+2x(x-2)+1

  6.9a^2-30ab^2+25b^4

  7.-4x^2+12xy-9y^2

  8.9(2a-b)^2-6(2a-b)+1

  9.-2m^3+24m^2-72m

  10.-x^4+2x^2y^2-y^4

  11.(x+y)^2+4(x-y)^2-4(x^2-y^2)

  12.(a^2+1)^2-4a^2

1回答
2020-06-15 10:24
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卢艳军

  1.

  1/2a^2-2ab+2b^2

  =1/2(a^2-4ab+4b^2)

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

  2.

  2x^3y+8x^2y^2+8xy^3

  =2xy(x^2+4xy+4y^2)

  =2xy(x+2y)^2

  3.

  -9x^2-3xy-1/4y^2

  =-(3x+1/2y)^2

  4.

  (x^2-x)^2+6(x^2-x)+9

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

  5.

  (x^2-2x)^2+2x(x-2)+1

  =(x^2-2x+1)^2

  =(x-1)^4

  6.

  9a^2-30ab^2+25b^4

  =(3a-5b^2)^2

  7.

  -4x^2+12xy-9y^2

  =-(2x-3y)^2

  8.

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

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

  =(6a-3b-1)^2

  9.

  -2m^3+24m^2-72m

  =-2m(m^2-12m+36)

  =-2m(m-6)^2

  10.

  -x^4+2x^2y^2-y^4

  =-(x^2-y^2)

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

  11.

  (x+y)^2+4(x-y)^2-4(x^2-y^2)

  =(x+y)^2-4(X+y)(X-y)+4(x-y)^2

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

  =(3y-x)^2

  12.

  (a^2+1)^2-4a^2

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

  =(a-1)^4

2020-06-15 10:27:23

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