七年级数学下册平方差公式专项训练 18.docx
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七年级数学下册平方差公式专项训练18
(x+6)(x-6)-x(x+2)(7x+2y)(7x-2y)-(7x+5)(7x-5)
6x(x-4)+(x-3)(x+3)(4m+7)(4m-7)
x(x+2)-(5-x)(5+x)(x-y)(x+y)+2y(x+y)
11
(a+—b)(a-—b)-(2a-5b)(2a+5b)1007×993
44
(9x-y)(9x+y)-3y(x-y)a2(8a+2b)(8a-2b)+a2b2
(8x+8)(8x-8)-8x(8x-6)(6x+2y)(6x-2y)+(6x+9)(6x-9)
6x(x-6)+(x-4)(x+4)(8m+6)(8m-6)
x(x+10)+(6-x)(6+x)(8x-y)(8x+y)-4y(x-y)
11
(a+—b)(a-—b)-(a-3b)(a+3b)906×894
55
(6x-y)(6x+y)+3y(x-y)a2(8a+6b)(8a-6b)+a2b2
(8x+3)(8x-3)-8x(8x+3)(8x+8y)(8x-8y)-(8x+3)(8x-3)
5x(x+3)+(x-3)(x+3)(4m+9)(4m-9)
x(x+10)+(5-x)(5+x)(9x-y)(9x+y)+2y(x-y)
11
(a+—b)(a-—b)+(4a-b)(4a+b)401×399
22
(5x-y)(5x+y)+2y(x+y)a2(8a+2b)(8a-2b)-a2b2
(8x+3)(8x-3)+8x(8x+9)(x+3y)(x-3y)+(x+3)(x-3)
4x(x-5)-(x-5)(x+5)(9m+8)(9m-8)
x(x+3)-(1-x)(1+x)(6x-y)(6x+y)+2y(x-y)
11
(a+—b)(a-—b)-(4a-3b)(4a+3b)903×897
22
(6x-y)(6x+y)+3y(x+y)a2(7a+4b)(7a-4b)+a2b2
(5x+4)(5x-4)-5x(5x+2)(8x+5y)(8x-5y)-(8x+7)(8x-7)
5x(x-4)+(x-4)(x+4)(3m+8)(3m-8)
x(x-10)+(4-x)(4+x)(7x-y)(7x+y)-2y(x+y)
11
(a+—b)(a-—b)+(4a-2b)(4a+2b)401×399
22
(6x-y)(6x+y)+5y(x-y)a2(3a+4b)(3a-4b)-a2b2
(x+4)(x-4)+x(x+3)(3x+7y)(3x-7y)+(3x+5)(3x-5)
3x(x-4)+(x-5)(x+5)(m+3)(m-3)
x(x+10)-(1-x)(1+x)(5x-y)(5x+y)+2y(x+y)
11
(a+—b)(a-—b)+(3a-4b)(3a+4b)405×395
55
(4x-y)(4x+y)-2y(x-y)a2(6a+9b)(6a-9b)-a2b2
(4x+1)(4x-1)+4x(4x-1)(8x+2y)(8x-2y)+(8x+1)(8x-1)
3x(x-9)+(x-1)(x+1)(9m+5)(9m-5)
x(x-10)+(7-x)(7+x)(7x-y)(7x+y)-3y(x-y)
11
(a+—b)(a-—b)+(5a-2b)(5a+2b)909×891
22
(8x-y)(8x+y)-4y(x+y)a2(5a+3b)(5a-3b)+a2b2
(5x+3)(5x-3)-5x(5x-6)(6x+3y)(6x-3y)-(6x+1)(6x-1)
2x(x+5)+(x-1)(x+1)(6m+2)(6m-2)
x(x-3)-(1-x)(1+x)(8x-y)(8x+y)+3y(x-y)
11
(a+—b)(a-—b)+(4a-5b)(4a+5b)607×593
44
(5x-y)(5x+y)+4y(x+y)a2(5a+2b)(5a-2b)+a2b2
(2x+1)(2x-1)+2x(2x+8)(7x+2y)(7x-2y)+(7x+7)(7x-7)
4x(x+7)-(x-4)(x+4)(9m+6)(9m-6)
x(x+10)-(6-x)(6+x)(x-y)(x+y)-5y(x-y)
11
(a+—b)(a-—b)-(2a-2b)(2a+2b)803×797
55
(6x-y)(6x+y)-4y(x-y)a2(7a+4b)(7a-4b)-a2b2
(3x+4)(3x-4)-3x(3x+9)(5x+y)(5x-y)-(5x+3)(5x-3)
5x(x+6)+(x-4)(x+4)(6m+2)(6m-2)
x(x-6)-(5-x)(5+x)(7x-y)(7x+y)-3y(x-y)
11
(a+—b)(a-—b)-(a-3b)(a+3b)907×893
44
(5x-y)(5x+y)-2y(x+y)a2(a+b)(a-b)+a2b2
(8x+2)(8x-2)-8x(8x+5)(9x+3y)(9x-3y)-(9x+3)(9x-3)
6x(x-7)-(x-3)(x+3)(9m+3)(9m-3)
x(x+2)-(3-x)(3+x)(7x-y)(7x+y)+4y(x+y)
11
(a+—b)(a-—b)+(5a-3b)(5a+3b)809×791
33
(3x-y)(3x+y)-4y(x-y)a2(5a+5b)(5a-5b)-a2b2
(2x+1)(2x-1)+2x(2x-3)(3x+7y)(3x-7y)+(3x+7)(3x-7)
4x(x-5)+(x-2)(x+2)(7m+4)(7m-4)
x(x+1)-(6-x)(6+x)(6x-y)(6x+y)-5y(x+y)
11
(a+—b)(a-—b)+(3a-2b)(3a+2b)604×596
55
(x-y)(x+y)-5y(x+y)a2(2a+7b)(2a-7b)-a2b2
(5x+7)(5x-7)+5x(5x+6)(x+5y)(x-5y)+(x+3)(x-3)
6x(x-4)-(x-4)(x+4)(2m+9)(2m-9)
x(x-8)-(2-x)(2+x)(9x-y)(9x+y)-3y(x+y)
11
(a+—b)(a-—b)+(2a-2b)(2a+2b)901×899
22
(3x-y)(3x+y)+3y(x-y)a2(4a+8b)(4a-8b)+a2b2
(8x+7)(8x-7)-8x(8x-7)(7x+9y)(7x-9y)+(7x+6)(7x-6)
2x(x+8)+(x-3)(x+3)(5m+6)(5m-6)
x(x+5)+(4-x)(4+x)(2x-y)(2x+y)-5y(x-y)
11
(a+—b)(a-—b)+(3a-4b)(3a+4b)208×192
55
(3x-y)(3x+y)+3y(x+y)a2(9a+8b)(9a-8b)-a2b2
(x+7)(x-7)-x(x-3)(x+6y)(x-6y)+(x+5)(x-5)
2x(x+8)+(x-5)(x+5)(4m+1)(4m-1)
x(x-4)-(3-x)(3+x)(6x-y)(6x+y)-3y(x-y)
11
(a+—b)(a-—b)-(4a-2b)(4a+2b)101×99
55
(8x-y)(8x+y)+5y(x-y)a2(2a+6b)(2a-6b)-a2b2
(x+7)(x-7)+x(x-2)(7x+y)(7x-y)-(7x+9)(7x-9)
2x(x-9)-(x-2)(x+2)(5m+2)(5m-2)
x(x+6)-(1-x)(1+x)(6x-y)(6x+y)-4y(x-y)
11
(a+—b)(a-—b)+(2a-b)(2a+b)302×298
44
(3x-y)(3x+y)-4y(x-y)a2(2a+b)(2a-b)+a2b2
(9x+4)(9x-4)+9x(9x-4)(2x+7y)(2x-7y)+(2x+8)(2x-8)
4x(x+1)+(x-2)(x+2)(2m+1)(2m-1)
x(x+7)+(4-x)(4+x)(2x-y)(2x+y)+5y(x-y)
11
(a+—b)(a-—b)+(5a-3b)(5a+3b)701×699
22
(8x-y)(8x+y)+2y(x-y)a2(4a+4b)(4a-4b)-a2b2
(3x+8)(3x-8)+3x(3x-7)(7x+2y)(7x-2y)-(7x+6)(7x-6)
5x(x-1)+(x-5)(x+5)(3m+4)(3m-4)
x(x-4)+(7-x)(7+x)(x-y)(x+y)+2y(x-y)
11
(a+—b)(a-—b)-(4a-5b)(4a+5b)403×397
55
(8x-y)(8x+y)+5y(x+y)a2(a+9b)(a-9b)-a2b2
(6x+3)(6x-3)+6x(6x+7)(3x+9y)(3x-9y)+(3x+3)(3x-3)
6x(x+4)-(x-5)(x+5)(6m+1)(6m-1)
x(x-2)+(8-x)(8+x)(4x-y)(4x+y)+2y(x-y)
11
(a+—b)(a-—b)-(3a-3b)(3a+3b)601×599
44
(8x-y)(8x+y)+5y(x-y)a2(3a+2b)(3a-2b)-a2b2