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7^56 = 7^ ( 6 +50) = 7^6 . 7^50
14^7 = ( 2.7)^7 = 2^7 . 7^7
10^15 = ( 2.5 )^15 = 2^5 . 5^15
27^7 = ( 3.9)^7 = 3^7 . 9^7
35^9 = ( 5.7 )^9 = 5^9 . 7^9
12^5 = ( 3.4 )^5 = 3^5 . 4^5
14^3 = ( 2.7 )^3 = 7^3 . 2^3
bài 11
\(6.6.6.6=6^4\) '\(b.5.15.15.15.3=15.15.15.15=15^4\)
\(c.81.3.3.3=3^4.3^3=3^7\)
bài 12.
\(a.765.5=153.5^2\)
\(b.837.7.7=93.21^2\)
\(c.568.8.2.4=71.8.2^6=71.2^9\)
1.
a) \(3^4\times3^5\times3^6=3^{4+5+6}=3^{15}\)
b) \(5^2\times5^4\times5^5\times25=5^2\times5^4\times5^5\times5^2=5^{2+4+5+2}=5^{13}\)
c) \(10^8\div10^3=10^{8-3}=10^5\)
d) \(a^7\div a^2=a^{7-2}=a^5\)
2.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
a) \(2^5\cdot2^7\)
\(=2^{5+7}\)
\(=2^{12}\)
b) \(2^3\cdot2^2\)
\(=2^{3+2}\)
\(=2^5\)
c) \(2^4\cdot2^3\cdot2^5\)
\(=2^{4+3+5}\)
\(=2^{12}\)
d) \(2^2\cdot2^4\cdot2^6\cdot2\)
\(=2^{2+4+6+1}\)
\(=2^{13}\)
e) \(2\cdot2^3\cdot2^7\cdot2^4\)
\(=2^{1+3+7+4}\)
\(=2^{15}\)
f) \(3^8\cdot3^7\)
\(=3^{8+7}\)
\(=3^{15}\)
g) \(3^2\cdot3\)
\(=3^{2+1}\)
\(=3^3\)
h) \(3^4\cdot3^2\cdot3\)
\(=3^{4+2+1}\)
\(=3^7\)
I) \(3\cdot3^5\cdot3^4\cdot3^2\)
\(=3^{1+5+4+2}\)
\(=3^{12}\)
a)=(-5)6=56
b)=(-6)3.(-7)3=[(-6)(-7)]3=423
c)=(-3).(-3)4.(-7)3(-7)2.(-2).(-2)4
=(-3)5.(-7)5.(-2)5
=[(-3)(-7)(-2)]5
=(-42)5
`2^5 . 8^4 = 2^5 . (2^3)^4 = 2^5 . 2^12 = 2^17`
`25^6 . 125^3 = (5^2)^6 . (5^3)^3 = 5^12 . 5^9 = 5^21`
`625^5 : 25^7 = (5^4)^7 : (5^2)^7 = 5^28 : 5^14 = 5^14`
`12^3 . 3^3 = (12 . 3)^3 = 36^3`
a) 24^8 = ( 3.8)^8 = 3^8 . 8^8
30^5 = ( 6.5 )^5 = 6^5.5^5
44^7 = (4.11)^7 = 4^7 . 11^7
22^6 = ( 2.11 )^6 = 2^ 6 .11^6
21^8 = ( 3.7 )^8 = 3^8 . 7^8
42^6 = ( 6 . 7 )^6 = 6 ^6 . 7^6
34^15 = ( 17 .7 )^15 = 17^15 . 7^15
50^7 = ( 2.25)^7 = 2^7 . 25^7
46^5 = ( 2.23)^5 = 2^25 . 23^25
111^5 = ( 3.37)^5 = 3^5 . 37^5