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23 tháng 2 2022

\(\dfrac{5}{3}>1\\ \dfrac{3}{4}< 1\\ \Rightarrow\dfrac{5}{3}>\dfrac{3}{4}\)

5/3>1>3/4

7 tháng 6 2015

\(\frac{2005}{2003}-1=\frac{2}{2003}\)

\(\frac{2003}{2001}-1=\frac{2}{2001}\)

Vì \(\frac{2}{2003}\frac{2003}{2001}\)

23 tháng 2 2022

\(\dfrac{14}{29}< \dfrac{14}{25}< \dfrac{23}{25}\\ \dfrac{39}{31}>\dfrac{39}{37}>\dfrac{38}{37}\)

23 tháng 2 2022

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\(\dfrac{3}{2x+4}=\dfrac{3}{2\left(x+2\right)}=\dfrac{3x-6}{2\left(x+2\right)\left(x-2\right)}\)

\(\dfrac{5}{x^2-4}=\dfrac{10}{2\left(x-2\right)\left(x+2\right)}\)

3 tháng 10 2015

2A=8(32+1)(34+1)......(364+1)

2A=(32-1)(32+1)(34+1)......(364+1)

2A=(34-1)((34+1)....(364+1)

2A=(364-1)(364+1)

2A=3128-1

Ta có :2A=B=>A<B

5 tháng 9 2021

\(P=4\left(3^2+1\right)\left(3^4+1\right)...\left(3^{64}+1\right)=\dfrac{1}{2}\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)...\left(3^{64}+1\right)=\dfrac{1}{2}\left(3^4-1\right)\left(3^4+1\right)...\left(3^{64}+1\right)=\dfrac{1}{2}\left(3^{128}-1\right)< 3^{128}-1=Q\)

5 tháng 9 2021

\(P=4\left(3^2+1\right)\left(3^4+1\right)...\left(3^{64}+1\right)\\ 2P=\left(3-1\right)\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)...\left(3^{64}+1\right)\\ 2P=\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)...\left(3^{64}+1\right)\\ 2P=\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)...\left(3^{64}+1\right)\\ 2P=\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)...\left(3^{64}+1\right)\\ 2P=\left(3^{16}-1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\left(3^{64}+1\right)\\ 2P=\left(3^{32}-1\right)\left(3^{32}+1\right)\left(3^{64}+1\right)\\ 2P=\left(3^{64}-1\right)\left(3^{64}+1\right)=3^{128}-1\\ P=\dfrac{3^{128}-1}{2}< Q=3^{218}-1\)

a: a>b

=>3a>3b

=>3a+5>3b+5

b: a>b

=>2a>2b

=>2a-3>2b-3>2b-4

22 tháng 1 2018

a) 3a + 5 > 3b + 5;          b) 2a - 3 > 2b - 4