на фото........................................
1) -3p2 + 6 - 7p или записать -( 3p2 + 7p - 6)
2) <span>(-24pq^2+28p^2q):(4pq) = ( - 48pq + 56pq) : 4pq = 8pq : 4pq = 2</span>
2(y - 1) - (y - 1)^2 = 0
(y - 1)(2 - (y - 1)) = 0
(y - 1)(2 - y + 1) = 0
(y - 1)( 3 - y) = 0
y - 1 = 0
y = 1
3 - y = 0
- y = - 3
y = 3
Ответ
3; 1
8 т.к
k1+..+kn =60
(k1+2)+...+(kn+2)=76
следовательно,n=8
1) = - 2 Sin45 Sin20 = - √2Sin 20
2) = 2Cos70Cos40
3) = 2Sin 45Cos25 = √2Cos25