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a) \(2^5\cdot2^7\)
\(=2^{5+7}\)
\(=2^{12}\)
b) \(2^3\cdot2^2\)
\(=2^{3+2}\)
\(=2^5\)
c) \(2^4\cdot2^3\cdot2^5\)
\(=2^{4+3+5}\)
\(=2^{12}\)
d) \(2^2\cdot2^4\cdot2^6\cdot2\)
\(=2^{2+4+6+1}\)
\(=2^{13}\)
e) \(2\cdot2^3\cdot2^7\cdot2^4\)
\(=2^{1+3+7+4}\)
\(=2^{15}\)
f) \(3^8\cdot3^7\)
\(=3^{8+7}\)
\(=3^{15}\)
g) \(3^2\cdot3\)
\(=3^{2+1}\)
\(=3^3\)
h) \(3^4\cdot3^2\cdot3\)
\(=3^{4+2+1}\)
\(=3^7\)
I) \(3\cdot3^5\cdot3^4\cdot3^2\)
\(=3^{1+5+4+2}\)
\(=3^{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết
12 1 13
12 – 02 (0 + 1)2
02 +12
22 1 + 3 23
32 – 12 (1 + 2)2
12 + 22
32 1 + 3 + 5 33
62 – 32 (2 + 3)2
22 + 32
43 102 – 62
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(2A-A=\left(2^2+2^3+...+2^{21}\right)-\left(2+2^2+...+2^{20}\right)\)
\(A=2^{21}-2\)
B tương tự câu A
\(5C-C=\left(5^2+5^3+...+5^{51}\right)-\left(5+5^2+...+5^{50}\right)\)
\(C=\dfrac{5^{51}-5}{4}\)
\(3D-D=3+3^2+...+3^{101}-\left(1+3+...+3^{100}\right)\)
\(D=\dfrac{3^{101}-1}{2}\)
\(A=2^1+2^2+2^3+...+2^{20}\)
\(2\cdot A=2^2+2^3+2^4+...+2^{21}\)
\(A=2^{21}-2\)
\(B=2^1+2^3+2^5+...+2^{99}\)
\(4\cdot B=2^3+2^5+2^7+...+2^{101}\)
\(B=\)\(\left(2^{101}-2\right):3\)
\(C=5^1+5^2+5^3+...+5^{50}\)
\(5\cdot C=5^2+5^3+5^4+...+5^{51}\)
\(C=(5^{51}-5):4\)
\(D=3^0+3^1+3^2+...+3^{100}\)
\(3\cdot D=3^1+3^2+3^3+...+3^{101}\)
\(D=(3^{101}-1):2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2A = 2 + 2^2 + 2^3 +...+ 2^11
2A-A = (2 + 2^2 + 2^3 +...+ 2^11) - (1 + 2 + 2^2 +...+ 2^10)
A = 2^11 - 1
b) 3B = 3 + 3^2 + 3^3 +...+ 3^101
3B-B = (3 + 3^2 + 3^3 +...+ 3^101) - (1 + 3 + 3^2 +...+ 3^100)
2B = 3^101 - 3
B = \(\frac{\text{3^101 - 3}}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)64:2mũ5×30×4
= 64 : 32 x 30 x 4
= 240
b)3 mũ 2× 5 - 2 mũ 2×7+2 mũ 0 × 5
= 9 x 5 - 4 x 7 + 1 x 5
= 45 - 28 + 5
= 22
c)2 mũ 3-5 mũ 3÷5 mũ 2 + 12×2 mũ 2
= 8 - 125 : 25 + 12 x 4
= 8 - 5 + 48
= 51
d)2[(7-3 mũ 3÷3 mũ 2) chia 2 mũ 2 + 99]-100
= 2[( 7 - 27 : 9) : 4 + 99] - 100
= 2[4 : 4 + 99] - 100
= 2. 100 - 100
= 200 - 100
= 100
e)4[(3 + 3^7:3^4)chia 10 + 97]-300
= 4[( 3 + 3^3) : 10 + 97] - 300
= 4[ 30 : 10 + 97 ] - 300
= 4. 100 - 300
= 400 - 300
= 100
f)2^2 x 5 [(5 mũ 2 cộng 2 mũ 3) chia 11 - 2] - 3^2 x 2
= 4 x 5 [ (25 + 8 ) : 11 - 2] - 9 x 2
= 20 [ 33 : 11 - 2] - 18
= 20. 1 - 18
= 20 - 18
= 2
![](https://rs.olm.vn/images/avt/0.png?1311)
cho \(S=2+2^2+2^3+...+2^{2011}\)
\(\Rightarrow2S=2^2+2^3+2^4+...+2^{2012}\)
\(\Rightarrow2S-S=2^{2012}-2\)
\(S=2^{2012}-2\)
Đặt : \(A=2+2^2+2^3+...+2^{2011}\)
\(\Rightarrow2A=2^2+2^3+2^4+...+2^{2012}\)
\(\Rightarrow2A-A=\left(2^2+2^3+2^4+...+2^{2012}\right)-\left(2+2^2+2^3+...+2^{2011}\right)\)
\(\Rightarrow A=2^{2012}-2\)
Vậy \(A=2^{2012}-2\)
~ Ủng hộ nhé