<span>1)
2х²-5=0,
2х</span>² = 5,
<span>х</span>² = 2,5,
<span>х1 = </span>√2,5,
х2 = -√2,5,
<span>
2)
-х²+3=0,
х</span>² = 3,
<span>х1 = </span>√3,
<span>х2 = -</span>√3,
<span>
3)
-3(х+3)²+48=0,
-3(х+3)</span>² = -48,
<span>(х+3)</span>² = 16,
<span>х+3 = 16,
х = 16-3,
х1 = 13,
х+3 = -16,
х = -16-3,
х2 = -19,
4)
(х-4)</span>²<span>=1/4,
х-4 = </span>√1/4,
<span>х-4 = 1/2,
х1 = 4 1/2,
х-4 = -</span>√1/4,
<span>х-4 = -1/2,
х2 = 3 1/2,
5)
(х+1)²-4=0,
(х+1)</span>²<span> = 4,
х+1 = </span>√4,
х+1 = 2,
х1 = 1,
х+1 = -2,
х2 = -3
80 : 2 = 40(однiй курицi на день)
Центнер=100 кг 100 кг / 5 * 4 = 80кг
19/7+х=9/2 |домножим на 7
19+7х=63/2 |домножим на 2
38+14х=63
14х=63-38
14х=25
х=25/14=1*11/14
х-13/5=26/15 |домножим на 15
15х-195/5=26 |домножим на 5
75х-195=130
75х=130+195
75х=325
х=325/75=65/15=13/3=4*1/3