(42^8+42^7)/43= [(42^7(42+1)]/43= (42^7 *43)/43= 42^7
Да,кратно.
F '(x)=(3x^2+2x+1)(x+1)+(x^3+x^2+x+1)
(5а-2)²=25а²-10а+4========================================
b1 = 88; q = 2; S5 = ?
Sn = b1 · (q^n - 1)/(q - 1)
n = 5
S5 = 88 · (2^5 - 1)/(2 - 1) = 88 · (32 - 1)/1 = 88 · 31 = 2728
Ответ: 2728