15х-(-3 х-(19-18 х))+3х=х+90+2х
15х-(-3х-19+18х)+3х=х+90+2х
15х-3х+19-18х+3х=х+90+2х
15х-3х-18х+3х-2х-х=90-19
-6х=71
х=-71/6
х=11 цел 5/6
.......................................
5^(1/5)=5^(4/20);
5^(1/20) * 5^(4/20) = 5^(5/20)=5^(1/4);
5^(1/4) / 5^(1/4)=1;
<span>sin^2x–5sinx+4=0
D = 25 - 16 = 9
sinx1 = 5 - 3 = 2
sinx2 = 5+3 = 8
наименьший sinx1</span>
X- в первом мешке, тогда во втором х+12
Х+Х+12=72
2х=60
Х=30
30+12=42