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\(\left(5^{103}-5^{102}-5^{101}\right):\left(5^{99}.26-5^{99}\right)\)
\(=\left(5^{103}-5^{102}-5^{101}\right):[5^{99}\left(26-1\right)]\)
\(=\left(5^{103}-5^{102}-5^{101}\right):5^{101}\)
\(=5^{103}:5^{101}-5^{102}:5^{101}-5^{101}:5^{101}\)
\(=5^2-5-1=19\)
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\(\left(5^{103}-5^{102}-5^{101}\right)\text{ : }\left(5^{99}\cdot26-5^{99}\right)\)
\(=\left[5^{101}\left(5^2-5-1\right)\right]\text{ : }\left[5^{99}\left(26-1\right)\right]\)
\(=\left[5^{101}\cdot19\right]\text{ : }\left[5^{99}\cdot25\right]\)
\(=\left[5^{101}\cdot19\right]\text{ : }\left[5^{99}\cdot5^2\right]\)
\(=\left[5^{101}\cdot19\right]\text{ : }5^{101}\)
\(=5^{101}\cdot19\text{ : }5^{101}\)
\(=19\)
Đặt A=1.2.3+2.3.4+3.4.5+4.5.6+...+98.99.100
4A=(1.2.3+2.3.4+3.4.5+4.5.6+...+98.99.100)4
4A=1.2.3(4-0)+2.3.4(5-1)+3.4.5(6-2)+4.5.6(7-3)+...+98.99.100(101-97)
4A=1.2.3.4+2.3.4.5-1.2.3.4+3.4.5.6-2.3.4.5+4.5.6.7-3.4.5.6+...+98.99.100.101-97.98.99.100
4A=1.2.3.4-1.2.3.4+2.3.4.5-2.3.4.5+3.4.5.6-3.4.5.6+...+97.98.99.100-97.98.99.100+98.99.100.101
4A=98.99.100.101
=>A=98.99.100.101/4
=> A=24497550
18576: {\(105^0\)+[2.(102+101−100−99+98+97−96−95+.........+6+5−4−3+2+1)−201]}^3
Đặt A=102+101−100−99+98+97−96−95+...............+6+5−4−3+2+1
A=(102+101−100−99)+(98+97−96−95)+........+(6+5−4−3)+2+1
A=4+4+...........+4+3
A=4.25+3
A=103
⇒18576:{1050+[2.(102+101−100−99+98+97−96−95+.........+6+5−4−3+2+1)−201]}^3
=18576:[1+(2.103)−201]^3
=18576:63
=18576:216
=86
\(a,\)Đặt \(A=1+2+2^2+...+2^{99}+2^{100}\)
\(\Rightarrow2A=2+2^2+...+2^{100}+2^{101}\)
\(\Rightarrow2A-A=\left(2+2^2+2^3+...+2^{101}\right)-\left(1+2+2^2+...2^{100}\right)\)
\(\Rightarrow A=2^{101}-1\)
\(b,\)Đặt \(B=5+5^3+5^5+...+5^{97}+5^{99}\)
\(\Rightarrow5^2B=5^3+5^5+...+5^{99}+5^{101}\)
\(\Rightarrow25B-B=\left(5^3+5^5+...+5^{99}+5^{101}\right)-\left(5+5^3+...+5^{99}\right)\)
\(\Rightarrow24B=5^{101}-5\)
\(\Rightarrow B=\frac{5^{101}-5}{24}\)
a ) 8102 = 84.25+2 = ( 84 )25 . 82 = ( ...6 )25 . 64 = ( ...6 ) . 64 = ( ...4 )
b ) 2102 = 24.25+2 = ( 24 )25 . 22 = 1625 . 4 = ( ...6 ) . 4 = ( ...4 )
c ) 175 = 174 . 17 = ( ...1 ) . 17 = ( ...7 )
d ) 244 = 242.2 = ( 242 )2 = ( ...6 )2 = ( ...2 )
e ) 1321 = 134.5+1 = ( 134 )5 . 131 = ( ...1 )5 . 13 = ( ...1 ) . 13 = ( ...3 )
g ) 9999 = 992.49+1 = ( 992 )49 . 991 = ( ...1 )49 . 99 = ( ...1 ) . 99 = ( ...9 )
h ) 18176 = 184.44 = ( 184 )44 = ( ...6 )44 = ( ...6 )
i ) 14101 = 142.50+1 = ( 142 )50 . 141 = ( ...6 )50 . 14 = ( ...6 ) . 14 = ( ...4 )
\(\left(5^{103}-5^{102}-5^{101}\right):\left(5^{99}.26-5^{99}\right)\)
\(=5^{101}.\left(5^2-5-1\right):5^{99}.\left(26-1\right)\)
\(=5^{101}.\left(25-5-1\right):5^{99}.25\)
\(=5^{101}.19:5^{99}.5^2\)
\(=5^{101}.19:5^{99+2}\)
\(=\frac{5^{101}.19}{5^{101}}\)
\(=19\)