Sin7π/12-sinπ/12=2sinπ/4cosπ/3=2*√2/2*1/2=√2/2
Найдем количество кустов ирги:
(30 - 6 - 15 - 3)/2 = (30 - 24)/2 = 6/2 = 3.
Найдем искомую вероятность:
p = m/n,
n = 30,
m = 6+3 = 9,
p = 9/30 = 3/10 = 0,3
Ответ. 0,3.
( 3a - b)( 2b + 4a) = 6ab + 12a² - 2b² - 4ab = 12a² - 2b² + 2ab = 2(6a² -b² + ab)
<span>1). 5(3-5a)^2-5(3a-7)(3a+7)=5(9-30a+25a²)×2-5(9a²-49)=2(45-150a+125a²)-45a²+245=90-300a+250a²-45a²+245=250a²+335-300a=250a²-300a+335
2). <span>(m-1)^2-4(m+1)^2-6(m+1)(m-1)=m²-2m+1-4(m²+2m+1)-6(m²+1)=m²-2m+1-4m²-8m-4-6m²-6=-9m²-10m-9=9m²+10m+9</span></span>
X-3=11*2;x-3=22;x=22+3;x=25