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\(A=1+3+3^2+...+3^{2007}\)
\(\Rightarrow3A=3+3^2+3^3+...+3^{2008}\)
\(\Rightarrow3A-A=\left(3+3^2+3^3+...+3^{2008}\right)-\left(1+3+3^2+...+3^{2007}\right)\)
\(\Rightarrow2A=3+3^2+3^3+...+3^{2008}-1-3-3^2-...-3^{2007}\)
\(\Rightarrow2A=3^{2008}-1\)
\(\Rightarrow2A+1=3^{2008}\)
\(A=1+3+3^2+...+3^{2007}\)
\(\Rightarrow3A=3+3^2+3^3+...+3^{2008}\)
\(\Rightarrow3A-A=\left(3+3^2+3^3+...+3^{2008}\right)-\left(1+3+3^2+...+3^{2007}\right)\)
\(\Rightarrow2A=3+3^2+3^3+...+3^{2008}-1-3-3^2-...-3^{2007}\)
\(\Rightarrow2A=3^{2008}-1\)
\(\Rightarrow2A+1=3^{2008}\)
Nhớ k cho mk nha!!!
3A=\(3+3^2+3^3+...+3^{11}\)
3A-A=(\(3+3^2+3^3+...+3^{11}\))-(\(1+3+3^2+...+3^{10}\))
2A=\(3^{11}-1\)
2A+1=\(3^{11}\)
a) \(4^3\cdot32^4\)
\(=\left(2^2\right)^3\cdot\left(2^5\right)^4\)
\(=2^6\cdot2^{20}\)
\(=2^{26}\)
b) \(3^{20}\cdot9^{10}\cdot27^2\)
\(=3^{20}\cdot\left(3^2\right)^{10}\cdot\left(3^3\right)^2\)
\(=3^{20}\cdot3^{20}\cdot3^6\)
\(=3^{46}\)
c) \(3^{10}\cdot7^{10}\)
\(=\left(3\cdot7\right)^{10}\)
\(=21^{10}\)
d) \(6^{15}:6^{14}\)
\(=6^{15-14}\)
\(=6\)
e) \(28^3:7^3\)
\(=4^3\cdot7^3:7^3\)
\(=4^3\)
\(=2^6\)
a: \(4^5\cdot8^7=2^{10}\cdot2^{21}=2^{31}\)
b: \(125^5\cdot25^3=5^{15}\cdot5^6=5^{21}\)
a) \(2^5:8^4=2^5:\left(2^3\right)^4=2^5:2^{12}=2^{-7}=\frac{1}{2^7}\)\(=\left(\frac{1}{2}\right)^7\)
b) \(25^6:125^3=\left(5^2\right)^6:\left(5^3\right)^3=5^{12}:5^9=5^3\)
c) \(625^2:25^7=\left(5^4\right)^2:\left(5^2\right)^7=5^8:5^{14}=5^{-6}=\frac{1}{5^6}=\left(\frac{1}{5}\right)^6\)
d) \(12^3.3^3=\left(12.3\right)^3=36^3\)
e) \(32^2:2^4=\left(2^5\right)^2:2^4=2^{10}:2^4=2^6\)
g) \(64.2:2^5=2^6.2:2^5=2^7:2^5=2^2\)
Mk làm hộ bn rùi đó nhớ ủng hộ mk nha ^_^
a) (1 phần 2 ) mũ 7
b) 5 mũ 3
c) (1 phần 5 ) mũ 6
d) 36 mũ 3
e) 2 mũ 6
g) 2 mũ 2
Ta có: \(A=2+2^2+2^3+...+2^{100}\)
\(2A=2^2+2^3+2^4+...+2^{101}\)
\(2A-A=2^{101}-2\)
Hay \(A=2^{101}-2\)
Vậy \(A=2^{101}-2\)
_Học tốt_
a) 1810 : 310 = (2.32)10 : 310 = 210 . 320 : 310 = 210 . 310 = 610
b) 276 : 9 = (33)6 : 9 = 318 : 32 = 318-2 = 316
c) Thiếu dữ liệu đề bài
d) 225 : 324 = 225 : (25)4 = 225 : 220 = 25
Bài 2 : 5.x2 = 245 => x2 = 245:5 = 49 => x = \(\pm\)7
3A=3+32+33+....+32008
2A=(3+32+....+32008)-(1+3+...+32007)=32008-1