7)
182/3640*100=5%
Ответ: 1)
8)
x² - 7x + 12 = 0
D = (-7)² - 4·1·12 = 49 - 48 = 1
x1 = (7 - √1)/(2·1) = (7 - 1)/2 = 6/2 = 3
x2 = (7 + √1)/(2·1) = (7 + 1)/2 = 8/2 = 4
Ответ:3
9) в точке D у=0
3x² + 4x - 15 = 0
D= 4²- 4·3·(-15) = 16 + 180 = 196
x1 = (-4 - √196)/(2·3) = (-4 - 14)/6 = -18/6 = -3
x2 = (-4 + √196)/(2·3) = (-4 +14)/6 = 10/6 =5/3=1 2/3
Ответ:-3