Bài 8:

a) \(2^{225}=\left(2^3\right)^{75}=8^{75}\)

\(3^{150}=\left(3^2\right)^{75}=9^{75}\)

Vì \(8^{75}< 9^{75}\Rightarrow2^{225}< 3^{150}\)

b) \(2^{91}=\left(2^{13}\right)^7=8192^7\)

\(5^{35}=\left(5^5\right)^7=3125^7\)

Vì \(8192^7>3125^7\Rightarrow2^{91}>5^{35}\)

c) \(99^{20}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\)

c: \(3=\sqrt{16}-1< \sqrt{17}-1\)

Ta có: 

\(5^{217}>5^{216}\)

Mà: \(5^{216}=5^{3\cdot72}=\left(5^3\right)^{72}=125^{72}\)

Lại có: \(125>119\Rightarrow125^{72}>119^{72}\)

\(\Rightarrow5^{216}>119^{72}\)

\(\Rightarrow5^{217}>119^{72}\)

454>578-987

487<758

4+5x5=29

454>578-987

487<758

4+5x5=29

tick nha bn

a: \(11^{14}< 11^{15}\)

b: \(4^{300}=64^{100}\)

\(3^{400}=81^{100}\)

mà 64<81

nên \(4^{300}< 3^{400}\)

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a, Có 3 = (3) = 9 và 2 = (2) = 8 => 3 > 2

b, Có 6 = (6) = 36 => 6 > 12

37,37 x 5959,59 = 37 x 1,01 x 59 x 101,01 = 37 x 59 x 1,01 x 101,01

59,59 x 3737,37 = 59 x 1,01 x 37 x 101,01 = 37 x 59 x 1,01 x 101,01

=> 37,37 x 5959,59 = 59,59 x 3737,37
                                              Kick mik nha

a) 5³⁶ và 11²⁴

Ta có: 5³⁶= (5³)¹²=125¹²  (1)

             11²⁴=(11²)¹²=121¹² (2)

Từ (1) và (2) => 5³⁶>11²⁴

^{tương tự.....}

Đáp án là :

câu 20 :625 < 1257

câu 21 :536 > 1124

câu 22 :32n < 23n

câu 23 :523 < 6.522

câu 24 :1124 <19920

câu 25 :399 > 112

a) Ta có: \(5^{36}=\left(5^3\right)^{12}=125^{12}\)

\(11^{24}=\left(11^2\right)^{12}=121^{12}\)

mà \(125^{12}>121^{12}\left(125>121\right)\)

nên \(5^{36}>11^{24}\)

b) Ta có: \(3^{2n}=\left(3^2\right)^n=9^n\)

\(2^{3n}=\left(2^3\right)^n=8^n\)

mà \(9^n>8^n\left(9>8\right)\)

nên \(3^{2n}>2^{3n}\)

a) Ta có: 3,23 < 3,32 nên -3,23 > -3,32

b) Ta có: \( - \frac{7}{3} = \frac{{ - 28}}{{12}}; - 1,25 = \frac{{ - 125}}{{100}} = \frac{{ - 5}}{4} = \frac{{ - 15}}{{12}}\)

Vì -28 < -15 nên \(\frac{{ - 28}}{{12}} < \frac{{ - 15}}{{12}}\) hay \( - \frac{7}{3}\) < -1,25

Đề khó hiểu quá bn ơi

\(b,\left(\sqrt{27}\right)^2=27>25=5^2\Rightarrow\sqrt{27}>5\\ c,6^2=36< 41=\left(\sqrt{41}\right)^2\Rightarrow6< \sqrt{41}\\ d,\left(\sqrt{79}\right)^2=79< 81=9^2\Rightarrow\sqrt{79}< 9\\ e,7^2=49>47=\left(\sqrt{47}\right)^2\Rightarrow7>\sqrt{47}\\ f,\left(\sqrt{123}\right)^2=123>100=10^2\Rightarrow\sqrt{123}>10\)