七年级数学下册平方差公式专项训练 20.docx
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七年级数学下册平方差公式专项训练 20.docx
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七年级数学下册平方差公式专项训练20
(7x+1)(7x-1)+7x(7x+4)(8x+5y)(8x-5y)+(8x+4)(8x-4)
2x(x-1)+(x-4)(x+4)(6m+2)(6m-2)
x(x+6)+(2-x)(2+x)(7x-y)(7x+y)-4y(x-y)
11
(a+—b)(a-—b)-(2a-5b)(2a+5b)601×599
33
(x-y)(x+y)-5y(x-y)a2(2a+3b)(2a-3b)+a2b2
(x+5)(x-5)+x(x-6)(4x+9y)(4x-9y)-(4x+4)(4x-4)
2x(x-4)+(x-3)(x+3)(m+1)(m-1)
x(x-10)-(1-x)(1+x)(8x-y)(8x+y)-3y(x-y)
11
(a+—b)(a-—b)-(5a-b)(5a+b)107×93
33
(8x-y)(8x+y)-2y(x-y)a2(8a+9b)(8a-9b)-a2b2
(8x+3)(8x-3)+8x(8x+8)(4x+4y)(4x-4y)-(4x+1)(4x-1)
3x(x-1)-(x-5)(x+5)(8m+4)(8m-4)
x(x-10)+(5-x)(5+x)(4x-y)(4x+y)+4y(x-y)
11
(a+—b)(a-—b)+(4a-3b)(4a+3b)1009×991
33
(2x-y)(2x+y)-2y(x-y)a2(6a+3b)(6a-3b)-a2b2
(9x+1)(9x-1)+9x(9x+1)(5x+7y)(5x-7y)+(5x+3)(5x-3)
4x(x+7)-(x-1)(x+1)(4m+7)(4m-7)
x(x+3)+(8-x)(8+x)(6x-y)(6x+y)-5y(x-y)
11
(a+—b)(a-—b)-(3a-5b)(3a+5b)309×291
33
(2x-y)(2x+y)-5y(x+y)a2(7a+b)(7a-b)+a2b2
(x+7)(x-7)+x(x+9)(8x+3y)(8x-3y)+(8x+2)(8x-2)
6x(x+4)-(x-4)(x+4)(7m+6)(7m-6)
x(x-5)-(9-x)(9+x)(6x-y)(6x+y)+3y(x+y)
11
(a+—b)(a-—b)+(4a-b)(4a+b)302×298
33
(8x-y)(8x+y)+5y(x-y)a2(8a+5b)(8a-5b)-a2b2
(6x+7)(6x-7)+6x(6x+2)(3x+5y)(3x-5y)-(3x+9)(3x-9)
2x(x+4)+(x-2)(x+2)(5m+1)(5m-1)
x(x-1)+(9-x)(9+x)(7x-y)(7x+y)+4y(x-y)
11
(a+—b)(a-—b)+(3a-b)(3a+b)607×593
22
(2x-y)(2x+y)-4y(x-y)a2(a+9b)(a-9b)+a2b2
(6x+5)(6x-5)-6x(6x-1)(8x+6y)(8x-6y)-(8x+9)(8x-9)
5x(x-8)-(x-4)(x+4)(2m+8)(2m-8)
x(x-1)-(3-x)(3+x)(x-y)(x+y)-4y(x-y)
11
(a+—b)(a-—b)-(3a-5b)(3a+5b)506×494
44
(8x-y)(8x+y)-3y(x+y)a2(9a+7b)(9a-7b)+a2b2
(9x+8)(9x-8)-9x(9x-5)(5x+y)(5x-y)+(5x+8)(5x-8)
5x(x+9)-(x-4)(x+4)(m+6)(m-6)
x(x-6)+(2-x)(2+x)(9x-y)(9x+y)-5y(x+y)
11
(a+—b)(a-—b)-(3a-2b)(3a+2b)906×894
33
(9x-y)(9x+y)+4y(x-y)a2(3a+5b)(3a-5b)+a2b2
(4x+4)(4x-4)-4x(4x-9)(8x+5y)(8x-5y)-(8x+8)(8x-8)
6x(x+4)+(x-1)(x+1)(m+3)(m-3)
x(x-9)+(5-x)(5+x)(6x-y)(6x+y)+2y(x-y)
11
(a+—b)(a-—b)-(2a-2b)(2a+2b)1009×991
44
(8x-y)(8x+y)-3y(x+y)a2(5a+5b)(5a-5b)-a2b2
(x+4)(x-4)-x(x-5)(x+5y)(x-5y)-(x+1)(x-1)
6x(x-4)+(x-3)(x+3)(m+4)(m-4)
x(x+2)-(2-x)(2+x)(8x-y)(8x+y)+5y(x-y)
11
(a+—b)(a-—b)+(3a-4b)(3a+4b)403×397
33
(6x-y)(6x+y)+5y(x-y)a2(3a+2b)(3a-2b)+a2b2
(2x+2)(2x-2)-2x(2x+2)(3x+5y)(3x-5y)+(3x+6)(3x-6)
6x(x+3)+(x-5)(x+5)(6m+6)(6m-6)
x(x-6)+(7-x)(7+x)(9x-y)(9x+y)-3y(x+y)
11
(a+—b)(a-—b)+(4a-b)(4a+b)1008×992
55
(8x-y)(8x+y)+3y(x-y)a2(9a+9b)(9a-9b)+a2b2
(8x+8)(8x-8)+8x(8x+6)(6x+3y)(6x-3y)+(6x+2)(6x-2)
2x(x-7)-(x-3)(x+3)(7m+9)(7m-9)
x(x-9)-(4-x)(4+x)(3x-y)(3x+y)+5y(x-y)
11
(a+—b)(a-—b)-(a-2b)(a+2b)601×599
44
(x-y)(x+y)+3y(x-y)a2(a+7b)(a-7b)-a2b2
(3x+6)(3x-6)+3x(3x+2)(6x+2y)(6x-2y)-(6x+2)(6x-2)
3x(x+6)+(x-5)(x+5)(7m+4)(7m-4)
x(x-7)+(1-x)(1+x)(9x-y)(9x+y)-4y(x-y)
11
(a+—b)(a-—b)+(5a-5b)(5a+5b)808×792
44
(5x-y)(5x+y)-4y(x-y)a2(7a+6b)(7a-6b)-a2b2
(9x+2)(9x-2)+9x(9x-4)(3x+8y)(3x-8y)+(3x+4)(3x-4)
6x(x-7)-(x-4)(x+4)(4m+8)(4m-8)
x(x+7)-(3-x)(3+x)(6x-y)(6x+y)-3y(x+y)
11
(a+—b)(a-—b)+(3a-b)(3a+b)901×899
33
(4x-y)(4x+y)+5y(x+y)a2(6a+9b)(6a-9b)+a2b2
(x+4)(x-4)-x(x+4)(9x+5y)(9x-5y)-(9x+6)(9x-6)
4x(x-8)-(x-4)(x+4)(6m+4)(6m-4)
x(x-8)-(7-x)(7+x)(4x-y)(4x+y)+5y(x-y)
11
(a+—b)(a-—b)+(3a-b)(3a+b)308×292
33
(8x-y)(8x+y)+2y(x+y)a2(4a+3b)(4a-3b)-a2b2
(5x+6)(5x-6)-5x(5x-6)(3x+2y)(3x-2y)-(3x+2)(3x-2)
4x(x-5)-(x-2)(x+2)(2m+5)(2m-5)
x(x-9)+(1-x)(1+x)(9x-y)(9x+y)-3y(x+y)
11
(a+—b)(a-—b)+(5a-4b)(5a+4b)806×794
44
(3x-y)(3x+y)-3y(x-y)a2(a+b)(a-b)-a2b2
(8x+9)(8x-9)-8x(8x+8)(x+7y)(x-7y)-(x+5)(x-5)
6x(x-4)+(x-1)(x+1)(9m+1)(9m-1)
x(x-9)-(2-x)(2+x)(7x-y)(7x+y)-4y(x-y)
11
(a+—b)(a-—b)-(2a-2b)(2a+2b)401×399
44
(2x-y)(2x+y)+5y(x-y)a2(a+6b)(a-6b)-a2b2
(9x+2)(9x-2)-9x(9x-6)(6x+3y)(6x-3y)-(6x+2)(6x-2)
3x(x+7)+(x-4)(x+4)(3m+4)(3m-4)
x(x+3)-(2-x)(2+x)(8x-y)(8x+y)+2y(x+y)
11
(a+—b)(a-—b)-(5a-2b)(5a+2b)908×892
33
(5x-y)(5x+y)+3y(x-y)a2(6a+9b)(6a-9b)+a2b2
(8x+8)(8x-8)-8x(8x+4)(x+4y)(x-4y)-(x+6)(x-6)
4x(x+2)-(x-3)(x+3)(4m+4)(4m-4)
x(x-5)-(1-x)(1+x)(4x-y)(4x+y)+3y(x+y)
11
(a+—b)(a-—b)-(a-2b)(a+2b)702×698
22
(2x-y)(2x+y)-3y(x-y)a2(3a+2b)(3a-2b)+a2b2
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