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a) 538 = 5.100 + 3.10 + 8.1 = 5 . 10 2 + 3 . 10 1 + 8 . 10 0 .
b) 8609 = 8.1000 + 6.100 + 9.1 = 8 . 10 3 + 6 . 10 2 + 9 . 10 0 .
c) a b c = a.100 + b.100 + c.l = a . 10 2 + b . 10 1 + c . 10 0
d) a b c d = a.1000 + b.100 + c.10 + d = a . 10 3 + b . 10 2 + c . 10 1 + d . 10 0
a) 126 = 1 . 10 2 + 2 . 10 1 + 6 . 10 0
b) 1068 = 1 . 10 3 + 6 . 10 1 + 8 . 10 0
c, a 0 b = a . 10 2 + b . 10 0
d, a 0 b c = a . 10 3 + b . 10 1 + c . 10 0
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.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
\(213=\)\(2.10^2\) \(+1.10+3.10^0\)
\(421=4.10^2+2.10+1.10^0\)
\(1256=1.10^3+2.10^2+1.10^0\)
\(2006=2.10^3+0.10^2+0.10+6.10^0\)
abc = a . 10 ^2 + b .10 + c .10 ^ 0
abcde = a.10 ^ 4 + b.10^3 + c.10^ 2+ d .10 + e . 10 ^ 0
k cho mk nha
a) 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.102 + 101 + 3
b) 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.102 + 2.101 + 1
c) 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.103 + 9
d) abc = a.100 + b.10 + c = a.102 + b.101 + c
e) abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.104 + b.103 + c.102 + d.101 + e
a) 538 = 5 . 100 + 3 . 10 + 8 . 1 = 5 . 10 2 + 3 . 10 1 + 8 . 10 0 .
b) 8609 = 8 . 1000 + 6 . 100 + 9 . 1 = 8 . 10 3 + 6 . 10 2 + 9 . 10 0 .
a) a b c = a . 100 + b . 100 + c . 1 = a . 10 2 + b . 10 1 + c . 10 0
b) a b c d ¯ = a . 1000 + b . 100 + c . 10 + d = a . 10 3 + b . 10 2 + c . 10 1 + d . 10 0