lũy thừa 7^3. 7 .7 là ạ
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\(A=7+7^2+.....+7^{200}\)
\(7A=7^2+7^3+7^4+.....+7^{201}\)
\(7A-A=6A=7^{201}-7\)
\(\Rightarrow6A+7=7^{201}\)
Vậy 6A + 7 là 1 luỹ thừa của 7
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\(3+4^x=4\)
\(4^x=4-3\)
\(4^x=1=4^0\)
\(=>x=0\)
______
\(11-4^x=7\)
\(4^x=11-7\)
\(4^x=4=4^1\)
\(=>x=1\)
_______
\(273-3.4^x=3^4\)
Kiểm tra lại câu này.
a: 3+4^x=4
=>4^x=1
=>x=0
b: 11-4^x=7
=>4^x=4
=>x=1
c: 273-3*4^x=3^4
=>3*4^x=273-81=192
=>4^x=64
=>x=3
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A = 7 + 72 + 73 + ... + 7100
7A = 72 + 73 + 74 + ... + 7101
7A - A = ( 72 + 73 + 74 + ... + 7101 ) - ( 7 + 72 + 73 + ... + 7100 )
6A = 7101 - 7
6A + 7 = 7101 - 7 + 7 = 7101 là B ( 7 )
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25 = 32 238 = 78310985281
88 = 16777216 999 = 9135.........899
37 = 2187 476 = 10779215329
67 = 279936 255 = 9765625
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7S=72+73+74+...+750
=>7S-S=750-7
=>6S=750-7
=>6S+7=750(lũy thừa của 7)
vậy...
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( 9 . x - 62 )10 = 74 : 74
( 9 . x - 62 )10 = 1
( 9 . x - 62 )10 = 110
=> 9 . x - 62 = 1
9 . x = 1 + 62
9 . x = 63
x = 63 : 9
x = 7
\(7^3\cdot7\cdot7=7^{3+1+1}=7^5\)