А) 8х+3у-6х-5у = 2х-2у = 2(х-у)
Б)2а-(3с-а)+(3с-2а) = 2а-3с+а+3с-2а = а
В) 6(а-2)-3(2а-5) = 6а-12-6а+10 = -2
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
b1•(q^n–1) 224•(q^n–1)
Sn = --------------- = ------------------ =
q–1 -0,5
= –448•(q^n–1)
–448•q^n+448 = 441
–448•q^n = –7
q^n = 1/64
(1/2)^n = (1/2)^6
n=6
3(x^2-8x+16)-3x^2=3x^2-24x+48-3x^2= -24x+48