33+54-24/8*13*(6-364/91) = 9
1) 364/91 = 4
2) 6 - 4 = 2
3) 24/8 = 3
4) 13 × 3 = 39
5) 39 × 2 = 78
6) 33 + 54 = 87
7) 87 - 78 = 9
Ответ: 9
<span>а13 = - 66, d = - 4</span>
<span>а13 = а1 + 12d</span>
a1 = a13-12d = -66-12*(-4) = -18
S = (2*a1+d(n-1))*n/2
S11 = (2*(-18)+10*(-4))*11/2 = (-36-40)*11/2 = 418
Ответ: 418
......... ......... . ........
345*90=31050р пом 400*35=14000р св 2000*77=15400р ог