So sanh 8^18va27^11
so sanh phan so 11/105;-8/-25
\(\dfrac{11}{105}=\dfrac{55}{525}\)
\(\dfrac{-8}{-25}=\dfrac{8}{25}=\dfrac{168}{525}\)
Vì \(\dfrac{55}{525}< \dfrac{168}{525}\Rightarrow\dfrac{11}{105}< \dfrac{-8}{-25}\)
tim so trung gian
so sanh 11/19 va 13/18
so sanh 5/9va 7/8
so sanh 5/11va 4/13
Cho A= - 4/7+ 4/19+ -4/23 : 8/7- 8/19+ 8/23 ; B= 0,4 -2/9+ 2/11 : 1,4 - 7/9+ 7/11 so sanh A va B
( Các bạn giải nhanh giúp mình với)
So sanh:
a)21^15 va 27^5×49^8
b)3^99 va 11^21
so sanh : 2/3 ......3/4
: 9/11 ......9/13
:15/8 ......15/11
\(\frac{2}{3}< \frac{3}{4}\)
\(\frac{9}{11}>\frac{9}{13}\)
\(\frac{15}{8}>\frac{15}{11}\)
cau 1 so sanh
3^39vaf 11^21
câu 2 cho S =1+2+262+...+2^9. Hãy so sanh s S voi 5.2^8
câu 3 cm 3^2008 la so co it hon 1005 c/s
Câu 4 so 2^100 co bao nhieu c/s
Bai 1 :Tinh nhanh
A= 3 / 5 x 8 + 3 / 8 x 11 + 3 / 11 x 14 + ....... + 3 / 95 x 98 + 3 / 98 x 101
Bai 2 :So sanh phan so voi 1:
2009 x 2011 + 2010 / 2008 x 2012 + 2009
so sanh
a.27^11 va 81^8
b.63^15 va 34^18
cac ban giup minh vs nhe !
a. \(27^{11}=\left(3^3\right)^{11}=3^{3\cdot11}=3^{33}\)
\(81^8=\left(3^4\right)^8=3^{4\cdot8}=3^{32}\)
Vì 32<33 => 332<333 => 818<2711
b. \(63^{15}=\left(63^5\right)^3=992436543^3\)
\(34^{18}=\left(34^6\right)^3=1544804416^3\)
Vì 992436543<1544804416 nên 9924365433<15448044163 => \(63^{15}< 34^{18}\)