Question

помогите решить №597
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Answer 1

1. 16 - b^2 = (4 - b)(4 + b); 2) c^2 - 49 = (c - 7)(c + 7); 3) 0,04 - a^2 = (-a - 0.2)(a - 0.2); 4) x^2 - 4/9 = (x - 2/3)(x + 2/3); 5) 4x^2 - 25 = (2x - 5)(2x + 5); 6) 81c^2 - 64d^2 = (9c - 8d)(9c + 8d); 7) 0,09x^2 - 0,25y^2 = -0.12(0.3x - 0.5y)(0.3x + 0.5y); 8) a^2b^4 - c^6d^8 = (ab^2 - cd^4)(ab^2 + cd^4); 9) 4a^2c^2 -9x^2y^2 =(2ac - 3xy)(2ac + 3xy); 10) x^12 - y^11 = (x^6 - y^5)(x^6 + y^5); 11) - 1600 + a^6 = -(40 - a^3)(40 + a^3); 12) a^9 - 49/64 = (a^3 - 7/8)(a^3 + 7/8).