1+1/10=11/10
1+1/11=12/11
1+1/12=13/12
...
1+1/25=26/25
<span>(1+1/10)(1+1/11)(1+1/12)...(1+1/25)=(11</span>×12×13×...×26)/(10×11×12×...×25)=
26/10=2,6
все остальное сократилось
8x^2 + x - 9 = 0
D = 1 + 4*9*8 = 17^2
x1 = ( - 1 + 17)/16 = 1;
x2 = ( - 1 - 17)/16 = - 9/8
8x^2 + x - 9 = 8(x + 9/8) (x - 1) = (8x + 9) (x - 1)
<span>(12- 5/8) : (2 7/24 + 5 5/6)*(2 1/3 - 1 13/21) - 3/5=
= (11 8/8 - 5/8) :(2 7/24 + 5 20/24)*(2 7/21 - 1 13/21) - 3/5=
= 11 3/8 : 7 27/24 * (1 28/21 - 1 13/21) - 3/5=
= 91/8 * 8/65 * 15/21 -3/5 = 1 - 3/5 = 5/5 - 3/5 = 2/5
</span>
s² + 5s ≤ 14
s² + 5s - 14 ≤ 0
(s - 2)(s + 7) ≤ 0
+ - +
_________[-7]___________[2]_________
/////////////////////////
s ∈ [- 7 ; 2]
Наибольшее целочисленное решение неравенства : 2