bn vào /h7.net/hoi-dap/toan-6/so-sanh-a-3-10-1-3-9-1-va-b-3-9-1-3-8-1--faq205231.html
Trả lời:
A = \(\frac{3^{10}+1}{3^9+1}=\frac{3.3^9+1}{3.3^8+1}=\frac{3^9+1}{3^8+1}\)= B
_Học tốt bạn nha_
So sanh A va B, biet :
a)\(A=\frac{1+5+5^2+...+5^9}{1+5+5^2+...+5^8};B=\frac{1+3+3^2+...+3^9}{1+3+3^2+...+3^8}\)
b)\(A=\frac{7^{10}}{1+7+7^2+...+7^9};B=\frac{5^{10}}{1+5+5^2+...+5^9}\)
so sanh: A= \(\frac{3^{10}+1}{3^9+1}\) voi B=\(\frac{3^9+1}{3^8+1}\)
So sanh A va B.
1so sanh cac phan so sau
a,2/3 va -1/4
b -7/10 va 7/-8
c 6/7 va 3/5
d -14/21 va 60/-72
e 16/9 va24/13
g 27/82 va 26/75
So sanh 3^10+1 / 3^9+1 va 3^9+1 / 3^8+1
cac phan so \(\frac{n+1}{2n+3}\)va\(\frac{2n+1}{2n+3}\)la cac phan so toi gian voi moi so nguyen n khac -1
tim n de cac cac phan so sau la phan so toi gian
\(\frac{n+7}{3};\frac{n+8}{4};\frac{n+9}{5};\frac{n+10}{6};\frac{n+11}{7}\)
so sanh
A=1+5+5^2+....++5^9 / 1+5+5^2+...+3^8 va B=1+3+3^2+...+3^9 / 1+3+3^2+...+3^8
so sanh
\(\frac{10^9}{10^9-3}\)
va
\(\frac{10^9+2}{10^9-1}\)
giai chi tiet dum minh nhoa
