(a＋7)(a－7) 803×797
(4y＋9)(4y－9) (a＋b)(a－b)
(9x＋8y)(9x－8y) (a＋3b)(a－3b)
(－4x＋y)(－4x－y) (10＋y)(－10＋y)
(a＋7)(a－7)＋(a＋7)(a－3) (y＋1)(y－1)－(3y－6)(2y＋7) (t＋10)(t－10) 601×599
(5x＋7)(5x－7) (3a＋b)(3a－b)
(x＋3y)(x－3y) (7＋8b)(7－8b)
(x＋4y)(x－4y) (9x＋2y)(－9x＋2y)
(b＋4)(b－4)＋(b－6)(b－7) (10t＋5)(10t－5)＋(4t＋9)(3t＋3) (c＋4)(c－4) 304×296
(9y＋1)(9y－1) (a＋4)(a－4)
(4x＋5y)(4x－5y) (a＋9b)(a－9b)
(x＋2y)(x－2y) (x＋7y)(－x＋7y)
(a＋1)(a－1)－(a＋8)(a－2) (b＋2)(b－2)＋(3b＋8)(4b－8) (t＋3)(t－3) 705×695
(8y＋2)(8y－2) (－a＋5)(－a－5)
(6x＋y)(6x－y) (6a＋b)(6a－b)
(－x＋5y)(－x－5y) (x＋y)(－x＋y)
(t＋10)(t－10)＋(t－1)(t＋3) (10c＋6)(10c－6)－(2c－4)(2c－8) (t＋7)(t－7) 44×36
(c＋10)(c－10) (－3a＋5)(－3a－5)
(4x＋y)(4x－y) (a＋b)(a－b)
(－2x＋y)(－2x－y) (6x＋y)(－6x＋y)
(a＋1)(a－1)－(a＋5)(a－5) (y＋5)(y－5)－(2y－9)(4y＋6) (s＋7)(s－7) 801×799
(x＋9)(x－9) (2a＋b)(2a－b)
(6x＋y)(6x－y) (7＋b)(7－b)
(－x＋2y)(－x－2y) (1＋4y)(－1＋4y)
(a＋7)(a－7)＋(a＋8)(a－7) (a＋3)(a－3)＋(3a＋3)(2a＋10) (b＋5)(b－5) 301×299
(a＋4)(a－4) (a＋3)(a－3)
(5x＋4y)(5x－4y) (5＋7b)(5－7b)
(x＋2y)(x－2y) (5＋7y)(－5＋7y)
(c＋7)(c－7)＋(c＋6)(c＋4) (y＋9)(y－9)－(4y＋6)(4y＋3) (t＋6)(t－6) 61×59
(2x＋1)(2x－1) (－a＋2)(－a－2)
(3x＋y)(3x－y) (2＋8b)(2－8b)
(－x＋3y)(－x－3y) (x＋y)(－x＋y)
(b＋6)(b－6)－(b－6)(b－1) (s＋3)(s－3)＋(3s－7)(3s－3)
(t＋4)(t－4) 45×35
(3y＋9)(3y－9) (－a＋8)(－a－8)
(x＋4y)(x－4y) (8＋2b)(8－2b)
(－7x＋5y)(－7x－5y) (7＋y)(－7＋y)
(s＋4)(s－4)－(s＋6)(s－8) (c＋2)(c－2)＋(3c＋2)(4c－1) (t＋8)(t－8) 902×898
(c＋3)(c－3) (8a＋b)(8a－b)
(6x＋2y)(6x－2y) (6＋b)(6－b)
(x＋y)(x－y) (8＋5y)(－8＋5y)
(y＋4)(y－4)＋(y＋6)(y－7) (6t＋1)(6t－1)－(2t－5)(2t＋9) (a＋10)(a－10) 705×695
(s＋9)(s－9) (－a＋6)(－a－6)
(x＋y)(x－y) (4＋b)(4－b)
(－4x＋y)(－4x－y) (5x＋8y)(－5x＋8y)
(a＋3)(a－3)＋(a＋4)(a－9) (a＋9)(a－9)－(4a－6)(4a＋5) (x＋1)(x－1) 401×399
(a＋6)(a－6) (a＋2)(a－2)
(x＋y)(x－y) (a＋b)(a－b)
(2x＋2y)(2x－2y) (x＋y)(－x＋y)
(y＋3)(y－3)＋(y＋1)(y－8) (a＋8)(a－8)＋(3a－8)(4a－3) (y＋7)(y－7) 94×86
(3x＋5)(3x－5) (－6a＋3b)(－6a－3b)
(5x＋y)(5x－y) (7＋b)(7－b)
(x＋y)(x－y) (6x＋y)(－6x＋y)
(y＋8)(y－8)＋(y＋1)(y＋3) (4y＋4)(4y－4)＋(3y＋7)(2y－2) (s＋4)(s－4) 404×396
(s＋2)(s－2) (5a＋b)(5a－b)
(x＋6y)(x－6y) (1＋8b)(1－8b)
(－3x＋y)(－3x－y) (9x＋y)(－9x＋y)
(y＋9)(y－9)－(y＋2)(y－1) (a＋1)(a－1)＋(4a＋4)(2a－3) (c＋6)(c－6) 35×25
(8y＋4)(8y－4) (8a＋b)(8a－b)
(2x＋y)(2x－y) (4a＋4b)(4a－4b)
(－x＋y)(－x－y) (9x＋y)(－9x＋y)
(b＋3)(b－3)－(b－6)(b＋8) (x＋5)(x－5)－(4x－6)(3x－5) (x＋8)(x－8) 55×45
(c＋7)(c－7) (－7a＋8b)(－7a－8b)
(3x＋7y)(3x－7y) (a＋6b)(a－6b)
(－x＋4y)(－x－4y) (3x＋8y)(－3x＋8y)
(b＋7)(b－7)＋(b－8)(b－8) (2s＋2)(2s－2)－(2s＋3)(2s－3)
