= 4/13 * 6,5n - 4/13 * 13/4 m + 3,2 * 5/8 n - 3,2 * 0,5m = 2n-m+2n-1,6m = 4n-2,6m
1-хкг
2-укг
3-zкг
{x+y+z=250 (1)
{x+y-z=-10 (2)
{y+z-x=110 (3)
(1)+(2) 2x+2y=240⇒x+y=120
(2)+(3) 2y=100⇒y=50кг
x+50=120
x=120-50
x=70кг
120+z=250
z=250-120
z=130кг
<span>2(4y-1)-5y<3y+5</span>
<span>8y-2-5y-3y-5<0</span>
<span>-7<0</span>
y - любое
6-6y-24y-8+30y+5.>0
5>0
y-любое
<span></span><span>№1: </span>
<span>
А) (х+4) 2=Х 2+8Х+16 </span>
<span>
Б) (У-5Х) 2=У 2-10ХУ+25Х 2 </span>
<span>
В) (3а-2)(3а+2)=9а2-</span><span>4</span>