Если нужно разложить на множители, то так :
25x² - 16y² = (5x)² - (4y)² = (5x - 4y)(5x + 4y)
<span>14; 19; 29; 40; 45 число (45) </span>
Ответ:2
.........................................................
345,348,340,358,354,350,380,384,385,305,304,308,403,405,408,430,435,438,450,453,458,480,483,485,503,504,508,530,534,538,540,543,548,580,584,583,803,804,805,834,830,835,845,840,843,850,853,854