X^2-10x+30<0
х^2-10х+30=0
Д=100-120, Д<0
нет решений
<span>x +by=3
ax-y=-24
1 + (-2)b = 3
1 - 2b= 3
-2b = 2
b = -1
a*1 -(-2) =- 24
a + 2 = -24
a = -26
Проверка:
1 + (-1)*(-2) = 3
1+2=3
3=3
(-26)*1 -(-2) = -24
-26 + 2 = -24
-24=-24
Ответ: а = -26; b = -1
</span>
Y=x^5/(x^4-1) на таком примере?
1) variant
1. c2-3c-2c+1-c2= c+1
2.7x+56+x2-64= x2+7x-8
3.4x2+20x-4x2-20x+25= 25
66/7*(9/33-107/33)=66/7*(-98/33)= -28