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Ta có: (-8).(-3)3.(+125)
= (-2)3 . (-3)3 . 53
= [(-2).(-3)]3.53 = 63 . 53
= (6.5)3 = 303
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: 27.(-2)3.(-7).(+49)
= 33 . (-2)3 . (-7) . (-7)2
= 33 . (-2)3 . (-7)3 = [3 . (-2) . (-7)]3 = 423
(Lưu ý: 49 = (-7)) . (-7) = (-7)2
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\(A=8^2\cdot32^4\\ =2^6\cdot2^{20}\\ =2^{26}\\ B=27^3\cdot9^4\cdot243\\ =3^9\cdot3^{12}\cdot3^5\\ =3^{26}\)
`A=8^2*32^4=(2^3)^2*(2^5)^4=2^6*2^20=2^26`
`B=27^3*9^4*243=(3^3)^3*(3^2)^4*3^5=3^9*3^8*3^5=3^22`
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 9 . 9 . 9 . 9 . 9 = 95
b) 10 . 10 . 10 . 10 = \(10^4\)
c) 5.5.5.25=5.5.5.5.5=\(5^5\)
d) a.a.a.a.a.a=\(a^6\)
a) 9.9.9.9.9=95 b) 10. 10. 10. 10=104
c) 5.5.5.25=5.5.5.5.5=55 d) a.a.a.a.a.a=a6
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(a,=5^{40}\cdot5^{12}=5^{52}\\ b,=x^{7+4+3}=x^{14}\\ c,=\left(3\cdot4\right)^6=12^6\)
\(8^5.16^2.32^4=2^{15}.2^8.2^{20}=2^{43}\)
\(27^5.81^9=3^{15}.3^{36}=3^{51}\)
\(64^3.256^2=2^{18}.2^{16}=2^{34}\)
\(125^3.75^2.105^4=5^9.3^2.5^4.3^4.5^4.7^4=3^6.5^{17}.7^4\)
643 .256 2 = 218 .216 = 234
là 643 chứ ạ