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a. \(5^{127}=5.5^{126}=5.125^{72}>119^{72}\)
\(\Rightarrow5^{217}>119^{72}\)
b. \(2^{1000}=\left(2^5\right)^{200}=32^{200}\)
\(5^{400}=\left(5^2\right)^{200}=25^{200}\)
\(\Rightarrow2^{1000}>5^{400}\)
c. \(9^{12}=\left(3^2\right)^{12}=3^{24}\)
\(27^7=\left(3^3\right)^7=3^{21}\)
\(\Rightarrow9^{12}>27^7\)
d. \(125^{80}=\left(5^3\right)^{80}=5^{240}\)
\(25^{118}=\left(5^2\right)^{118}=5^{236}\)
\(\Rightarrow125^{80}>25^{118}\)
e. \(5^{40}=\left(5^4\right)^{10}=625^{10}\)
\(\Rightarrow5^{40}>620^{10}\)
f. \(27^{11}=\left(3^3\right)^{11}=3^{33}\)
\(81^8=\left(3^4\right)^8=3^{32}\)
\(\Rightarrow27^{11}>81^8\)
+) \(\frac{-180}{270}=\frac{-2}{3}\) +) \(\frac{22}{-165}=\frac{-2}{15}\)
+) \(\frac{-39}{261}=\frac{-13}{87}\) +) \(\frac{4.26}{52.20}=\frac{4.13.2}{4.13.2.10}=\frac{1}{10}\)
+) \(\frac{7.\left(-32\right)}{16.35}=\frac{7.\left(-2\right).16}{16.7.5}=\frac{-2}{5}\)
Học tốt
Bài 1:
a. $=(-25)(-4)(-35)=100(-35)=-3500$
b. $=16-10=6$
c. $=180-(-16)-(-36)=180+16+36=232$
d. $=250-200:[1(-3)^2+(-8)]$
$=250-200:(9-8)=250-200=50$
2.
$60+2(12-x)=-48$
$2(12-x)=60-(-48)=60+48=108$
$12-x=108:2=54$
$x=12-54=-42$
Bài 1:
a. $=(-25)(-4)(-35)=100(-35)=-3500$
b. $=16-10=6$
c. $180-(-16)-(-36)=180+16+36=196+36=232$
d. $=250-200:[2000.(-3).2-6]$
$=250-200:[2000.(-6)+(-6)]$
$=250-200:[(-6)(2000+1)]=250-200[(-6).2001]$
$=250+200.6.2001=250+2401200=2401450$
Bài 2:
$60+2(12-x)=-48$
$2(12-x)=-48-60=-108$
$12-x=-108:2=-54$
$x=12-(-54)=66$
a) 6 2010 : 6 10 = 6 2000
b) ( 3 8 . 3 16 ) : ( 3 7 . 3 14 ) = 3 24 : 3 21 = 3 3
c) ( 2 26 : 2 10 ) : ( 2 18 : 2 16 ) = 2 16 : 2 2 = 2 14
d) 25 3 : 125 = ( 25 . 25 . 25 ) : 5 3 = 5 6 : 5 3 = 5 3
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