no

s³-15s+14=0

<=>(s³-s)-(14s-14)=0

<=>s(s-1)(s+1)-14(s-1)=0

<=>(s-1)(s²+s-14)=0

<=>s-1=0<=>s=1

hoặc s²+s-14=0

<=>(s+1/2)²-14,25=0

<=>(s+1/2)²=14,25

<=>\(s+\frac{1}{2}=_-^+\sqrt{14,25}\Leftrightarrow s=_-^+\sqrt{14,25}-\frac{1}{2}\)

1000 = 10⁴

7¹⁶⁴ = (7²)⁸² = 49⁸² 

Vì 49 > 10; 82 > 4

=> 49⁸² > 10⁴

=> 7¹⁶⁴ > 1000

=> 1000 không chia hết cho 7¹⁶⁴

=> Sai đề

thank you

my name is ha