A1=2048 a2=-256 q=-256/2048=-1/8
S(5)=2048*(1-1/4096)/(9/8)=2048*4095/4096*8/9=455*4=1820
<span>7x-(x+3)=3(2x-1)</span>
<span>7x-x-3=6x-3</span>
<span>7x-x-6x=-3+3</span>
<span>0=0</span>
<span>
</span>
<span>x — любое число</span>
1346 1364 1436 1634 3146 3164 3614 3416 4136 6134 134 136 164 146 314 316 346 364 416 436 634 614 14 16 34 36 46 64 4 6 = 30