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B=\(\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
=>B=\(\left(3+1\right)\left(3-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
=>B=\(\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
=>B=\(\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
=>B=\(\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
=>B=\(\left(3^{16}-1\right)\left(3^{16}+1\right)=3^{32}-1\)
vậy B=\(3^{32}-1\)
chúc bạn hcoj tốt ^^
B = ( 3 + 1 ).( 32 + 1 ).(34+1).(38+1).(316+1)
=> 2B = 2.(3+1).(32+1).(34+1).(38+1).(316+1)
=> ( 3 -1 ).(3+1).(32+1).(34+1).(38+1).(316+1)
=> ( 32-1).(32+1).(34+1).(38+1).(316+1)
=> ( 34-1).(34+1).(38+1).(316+1)
=> ( 38-1).(38+1).(316+1)
=> ( 316-1).( 316 + 1)
= 332-1
=> A = 332-1:2<332-1
\(B=2\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)=\dfrac{8\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{4}=\dfrac{\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{4}=\dfrac{\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{4}=\dfrac{\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{4}=\dfrac{\left(3^{16}-1\right)\left(3^{16}+1\right)}{4}=\dfrac{3^{32}-1}{4}\)
=>A>B
A = (3 + 1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)
=>2A=2(3 + 1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)
=(3-1)(3 + 1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)
=(32-1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)
=(34-1)(34 + 1)(38 + 1)(316 + 1)
=(38-1)(38 + 1)(316 + 1)
=(316-1)(316+1)
=332-1
=>A=(332-1):2
=>A<B
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B=(3+1).(32+1).(34+1).(38+1).(316+1)
=>2B=2.(3+1).(32+1).(34+1).(38+1).(316+1)
=(3-1)(3+1).(32+1).(34+1).(38+1).(316+1)
=(32-1)(32+1).(34+1).(38+1).(316+1)
=(34-1).(34+1).(38+1).(316+1)
=(38-1)(38+1).(316+1)
=(316-1).(316+1)
=332-1
=>A=\(\frac{3^{32}-1}{2}<3^{32-1}\)
Vậy A<B
\(A=\left(3+1\right)\left(3^2+1\right)....\left(3^{16}+1\right)\)
\(2A=\left(3-1\right)\left(3+1\right)\left(3^2+1\right)....\left(3^{16}+1\right)\)\(2A=\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\)\(2A=\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(2A=\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(2A=\left(3^{16}-1\right)\left(3^{16}+1\right)\)
\(2A=\left(3^{32}-1\right)=B\Rightarrow B>A\)
Theo bài ra ta có:
\(A=\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=2\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=\left(3-1\right)\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=\left(3^{16}-1\right)\left(3^{16}+1\right)\\ \Rightarrow2A=3^{32}-1\\ \Rightarrow A=\dfrac{3^{32}-1}{2}\) ta thấy : \(\dfrac{3^{32}-1}{2}< 3^{32}-1\\ \)
=> A < B
vậy A < B
Ta có:
\(3^{32}-1=\left(3^{16}-1\right)\left(3^{16}+1\right)\)
\(=\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(=\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(=\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(=\left(3-1\right)\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(=2\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(\Rightarrow A< B\)
C1: 2A = (3-1 )(3+1)....(3^16)
Theo hằng đẳng thức thì a^2-b^2 thì 2A = 3^32 - 1 => A = (3^32-1) /2<B
C2 biến đổi B
B = 3^32 - 1 = (3^16- 1)(3^16 + 1)=(3^8 - 1)(3^8 + 1)= ... = 2(3+1)(3^2+1)..(3^16+1)>A
B = (3 + 1).(32 + 1).(34 + 1).(38 + 1).(316 + 1)
2B = (3 - 1).(3 + 1).(32 + 1).(34 + 1).(38 + 1).(316 + 1)
= (32 - 1).(32 + 1).(34 + 1).(38 + 1).(316 + 1)
= (34 - 1).(34 + 1).(38 + 1).(316 + 1)
= (38 - 1).(38 + 1).(316 + 1)
= (316 - 1).(316 + 1)
= 332 - 1
Vậy A = B
lộn r` bn B = 332-1 / 2
Vậy A > B