-5x-x>3+3
-6x>6
x<-1
Ответ: (-∞;-1) - 3
<span>10 - (х - 2у) = 18+4у, <span>2х - 3 (1 +у) = 2 ( 3х - у) </span></span>
<span>10-х+2у=18+4у 2х-3-3у=6х-2у</span>
<span>-х+2у-4у=18-10 2х-3у+2у-6х=3</span>
<span>-х-2у=8 -4х-у=3</span>
<span>-х=8+2у у=-3-4х</span>
<span>х=-8-2у </span>
... ..............................
(3а+1)(9а²-3а+1)=27a<span>^3+1
</span><span>a=1/2;
</span><span>27/8+1=3,375+1=4,375
Ответ:</span>4,375