примеры под номером: 61, 64, 66, 68, 70, 52, 54, 56, 58, 60.
61 )a12– b12
64) (a – 8)^2– 81
66) 9a^2– (4+a)^2
68) (3 – x)^2– 25x^2
70) 4 – (2x – 5)^2
52)( 9a^2x +5y3)(9a^2x – 5y^3)
54) ( 3y^6-5/8 x^2)( 3y^6 +5/8 x^2 )
56) 10a^2– (1 + 3a)(3a - 1)
58) (2 + y)(y – 2) – 4y^2
60) (3b + 5c)(5c – 3b) + 9b^2
можно сразу писать ответы, срочно
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