x8/27 = 243
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(-27\right)^{27}=\left(-3\right)^{3^{27}}=\left(-3\right)^{81}\)
\(\left(-243\right)^{13}=\left(-3\right)^{5^{13}}=\left(-3\right)^{65}\)
\(\Rightarrow\left(-27\right)^{27}< \left(-243^{13}\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :C= 2181-729+243.81-27
=2052+19683-27
C=21108
D=\(3^2.9^2.243+18.243.324.243\)
=9.81.243+18.243.324.243
=177147+344373768
=344550915
Ta có : C:D=21108:344550915=0,00006
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải
\(\left(-27\right)^{27}=\left(-3^3\right)^{27}=\left(-3\right)^{81}\)
\(\left(-243\right)^{13}=\left(-3^5\right)^{13}=\left(-3\right)^{63}\)
=>\(\left(-27\right)^{27}>\left(-243\right)^{13}\)
Bạn học tốt!^^
\(\left(-3^5\right)^{13}=\left(-3\right)^{65}\) nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
27 < 813 : 3x <243
⇒ 33 < (34)3 : 3x <35
⇒ 33 < 312 : 3x <35
⇒ 33 < 312-x <35
⇒ 3 <12-x < 5
⇒ -9 < x < 7
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\((4+x)\cdot27=243\\\Rightarrow4+x=243:27\\\Rightarrow4+x=9\\\Rightarrow x=9-4\\\Rightarrow x=5\\Vậy:x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
12x+243=3x-27
=> 12x-3x = -27 -243
=>9x = -270
=> x = -270 : 9
=> x = -30
Vậy x = -30
\(\frac{x^8}{27}\)= 243 àk ?
x8 = 243 x 27
x8 = 6561
x8 = 38
\(\Rightarrow\)x = 3