Tính nhanh
a) 2012 . 24 + 77 .2012 - 2012
= 2012.(24 + 77 - 1)
= 2012.100
= 201200
b) 33 .76 + 84 .27 + 32 . 3 . 40
= 33 .76 + 84 . 33 + 33 .40
= 33.(76 + 84 + 40)
= 27. 200
= 5400
c) \(\frac{2^{83}+2^{84}+2^{85}}{2^{82}+2^{81}+2^{80}}\)
\(=\frac{2^{83}.\left(1+2+2^2\right)}{2^{80}.\left(1+2+2^2\right)}\)
\(=\frac{2^{83}}{2^{80}}\)
\(=2^3\)
\(=8\)
\(a.\)\(2012.24+77.2012-2012\)
\(=2012.24+77.2012-2012.1\)
\(=2012.\left(24+77-1\right)\)
\(=2012.100\)
\(=201200\)
\(b.\)\(3^3.76+84.27+3^2.3.40\)
\(=27.76+84.27+27.40\)
\(=27.\left(76+84+40\right)\)
\(=27.200\)
\(=5400\)
\(c.\)Là phân số hả bn???
\(\frac{2^{83}+2^{84}+2^{85}}{2^{82}+2^{81}+2^{80}}=\frac{2^{83}.\left(1+2+2^2\right)}{2^{80}.\left(2^2+2+1\right)}\)
\(=\frac{2^{83}}{2^{80}}=2^3=8\)
~ Rất vui vì giúp đc bn ~
\(2012.24+77.2012-2012\)
\(=2012.24+2012.77-2012.1\)
\(=2012.\left(24+77-1\right)\)
\(=2012.100=201200\)
\(a,\text{ }2012\text{ x }24+77\text{ x }2012-2012\)
\(=2012\text{ x }\left(24+77-1\right)\)
\(=2012\cdot100\)
\(=201200\)
\(b,\text{ }3^3\text{ x }76+84\cdot27+3^2\text{ x }3\text{ x }40\)
\(=3^3\text{ x }76+84\text{ x }3^3+3^3\text{ x }40\)
\(=3^3\left(76+84+40\right)\)
\(=27\cdot200\)
\(=5400\)
Trả lời :
\(c,\text{ }\frac{2^{83}+2^{84}+2^{85}}{2^{82}+2^{81}+2^{80}}=\frac{2^{83}\left(1+2+2^2\right)}{2^{80}\left(1+2+2^2\right)}=\frac{2^{83}}{2^{80}}=2^3\)
\(Ng\text{ọ}c\text{ }Lan\)
\(2012.24+77.2012-2012\)
\(=2012.\left(24+77-1\right)\)
\(=2012.100\)
\(=201200\)
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