Х+2у=4
2у=4-х
у=2-0.5х
х²+х(2-0.5х)=2-0.5х-5
х²+2х-0.5х²=-0.5х-3
0.5х²+2х+0.5х+3=0
0.5х²+2.5х+3=0(×2)
х²+5х+6=0
D=25-4×6×1=25-24=1
x(1)=-5-1/2=-6/2=-3
x(2)=-5+1/2=-4/2-2
y(1)==2-0.5×(-3)=2+1.5=3.5
y(2)=2-0.5×(-2)=2+1=3
X + 8x + 96x = 22, 9x + 96x = 22, 105x = 22, x = 105 / 22, x = 4,773.
А)x(2x-y) b)ab(1+3ab) в)2yy(yy+3y-2)
14%=0,14
9000+0,14*9000=9000+1260=10260 (руб)
Ответ: 10260 руб.
2) а)=у б)=0,6а в)= -0,8х г)=1
3) а)=7√2 б)=4√10 в)=7√3 г)= -√50