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\(a.\) \(5\cdot5\cdot5\cdot5=5^4\)
\(b.\) \(9\cdot9\cdot9\cdot9\cdot9\cdot9\cdot9=9^7\)
\(c.\) \(7\cdot7\cdot7\cdot7\cdot7=7^5\)
\(d.\) \(a\cdot a\cdot a\cdot a\cdot a\cdot a\cdot a\cdot a=a^8\)
.a. 5⋅5⋅5⋅5=5^4
.b. 9⋅9⋅9⋅9⋅9⋅9⋅9=9^7
.c. 7⋅7⋅7⋅7⋅7=7^5
d. a⋅a⋅a⋅a⋅a⋅a.a.a=a^8
![](https://rs.olm.vn/images/avt/0.png?1311)
a) `7^4 .7^5 .7^6 = 7^(4+5+6)=7^(15)`
b) `(54:3^7) .324 =( 2.3^3 : 3^7).2^2 x3^4`
`=(2: 3^4).3^4 .2^2`
`= 2.2^2=2^3`
c) `[(8+2^2).10^100] : (10^0 .10^94)`
`=(12 . 10^100) : 10^94`
`=12 . (10^100 : 10^94)`
`=12 . 10^6`
d) `a^9 :a^9 = a^(9-9)=a^0`
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(3^4.3^5=3^9\)
\(16.2^9=2^4.2^9=2^{13}\)
\(16.32=2^4.2^5=2^9\)
b. \(12^8.12=12^9\)
\(243:3^4=3^5:3^4=3\)
\(10^9:10000=10^9:10^4=10^5\)
c. \(4.8^6.2.8^3=2^2.2^{18}.2.2^9=2^{30}\)
\(12^2.2.12^3.6=12^2.12.12^3=12^6\)
\(6^3.2.6^4.3=6^3.6.6^4=6^8\)
![](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
A=64=26=43=82
B=42.23=(22)2.23=24.23=27
C=53.1252=53.(53)2=53.56=59
D=34.273=34.(33)3=34.39=313