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Sửa đề: B=11^87+1/11^88+1
\(11A=\dfrac{11^{90}+11}{11^{90}+1}=1+\dfrac{10}{11^{90}+1}\)
\(11B=\dfrac{11^{88}+11}{11^{88}+1}=1+\dfrac{10}{11^{88}+1}\)
mà 11^90>11^88
nên A<B
Bài 1
a: 11/12=1-1/12
23/24=1-1/24
mà -1/12>-1/24
nên 11/12>23/24
b: -3/20=-9/60
-7/12=-35/60
mà -9>-35
nên -3/20>-7/12
a: \(98^{10}\cdot A=\dfrac{98^{98}+98^{10}}{98^{98}+1}=1+\dfrac{98^{10}-1}{98^{98}+1}\)
\(98^{10}\cdot B=\dfrac{98^{99}+98^{10}}{98^{99}+1}=1+\dfrac{98^{10}-1}{98^{99}+1}\)
98^88+1>98^99+1
=>A<B
b: \(\dfrac{1}{2022^2}\cdot C=\dfrac{2022^{2023}+1}{2022^{2023}+2022^2}=1+\dfrac{1-2022^2}{2022^{2023}+2022^2}\)
\(\dfrac{1}{2022^2}\cdot D=\dfrac{2022^{2021}+1}{2022^{2021}+2022^2}=1+\dfrac{1-2022^2}{2022^{2021}+2022^2}\)
2022^2023>2022^2021
=>2022^2023+2022^2>2022^2021+2022^2
=>\(\dfrac{2022^2-1}{2022^{2023}+2022^2}< \dfrac{2022^2-1}{2022^{2021}+2022^2}\)
=>\(\dfrac{1-2022^2}{2022^{2023}+2022^2}>\dfrac{1-2022^2}{2022^{2021}+2022^2}\)
=>C>D
\(\text{#040911}\)
\(a,\)
\(202^{303}\text{ và }303^{202}\)
Ta có:
\(202^{303}=\left(202^3\right)^{101}=\left(101^3\cdot2^3\right)^{101}=\left(101^3\cdot8\right)^{101}\)
\(303^{202}=\left(303^2\right)^{101}=\left(101^2\cdot3^2\right)^{101}=\left(101^2\cdot9\right)^{101}\)
Ta có:
\(8\cdot101^3=8\cdot101\cdot101^2=808\cdot101^2\)
Vì \(808>9\)
\(\Rightarrow808\cdot101^2>9\cdot101^2\)
\(\Rightarrow202^{303}>303^{202}\)
\(b,\)
Ta có:
\(11^{1979}< 11^{1980}=\left(11^3\right)^{660}=1331^{660}\\ 37^{1320}=\left(37^2\right)^{660}=1369^{660}\\ \text{Vì }1331< 1369\\ \Rightarrow1331^{660}< 1369^{660}\\ \Rightarrow11^{1979}< 37^{1320}\)
a)
11*311 = 1948617
313 = 1594323
vì 1948617 > 1594323 nên 11*311 > 313
b) 892 = 7921
88*90 = 7920
vì 7921 > 7920 nên 892 > 88*90
mình cảm ơn :3