<span>8 18 28 (+10) 38 (+10) 48 (+10) 58</span>
y = - x²+9 и y=0
x = 0 y = 9
y = y
- x²+9 = 0
x² = 9
x = 3 и x = -3
ʃ(- x²+9 )dx = - x³/3 + 9x
S = ( - 3³/3 + 9*3) - (- (-3)³/3 + 9*(-3) ) = -9+27 -9 +27 = 36
Z : 3\14 = 3 1\9 : 4\9
1) 3 1\9 : 4\9 = 28\9 : 4\9 = 28\4 = 7
2) Z : 3\14 = 7
Z = 7 * 3\14 = 3\2 = 1.5
ОТВЕТ: Z = 1.5