Question

(5c - 6) (5c + 6) - (5c - 6)² при c = 13 решить

Answer 1

(5 * 13 - 6)(5 * 13 + 6) - (5 * 13 - 6)(5 * 13 - 6) = 59 * 71  -  59 * 59 = 708