Ответ:
Объяснение:
1) (6-n)(6+n)
2)(0.757+0.243)(0.757-0.243) = 1*0.514 = 0.514
3) 1/9x^2 - 9 =0
(1/3x-3)(1/3x+3) = 0
x1 = 3; x2 = -3
4) (a+b)^2 / (a+b)(a-b)
(a+b) / (a-b)
a= 0.68 b = 0.32
(0.68+0.32) / (0.68-0.32) = 1/0.36 = 50/13
5) (61^2 - 57^2)= (61-57)(61+57) = 4*118 = 472
(31^2 - 27^2) = (31-27)(31+27) = 232, 472>232