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k mình nha!!

a) Chỉ cần so sánh \(\left(\frac{1}{16}\right)^{100}\)và \(\left(\frac{1}{2}\right)^{500}\)

Cách 1 : \(\left(\frac{1}{16}\right)^{100}\)= \(\left(\frac{1}{2}\right)^{400}>\left(\frac{1}{2}\right)^{500}\)

Cách 2 : \(\left(\frac{1}{16}\right)^{100}>\left(\frac{1}{32}\right)^{100}=\left(\frac{1}{2}\right)^{500}\)

b) Trước hết ta so sánh : 32⁹ và 18¹³

Ta có : 32⁹ < 2⁴⁵ < 2⁵² = 16¹³ < 18¹³

Vậy -32⁹ > -18¹³ tức là ( -32)⁹ > ( -18)¹³
 

a) \(49^{12}\)và \(5^{40}\)

\(49^{12}=\left(49^3\right)^4=\left(\left(7^2\right)^3\right)^4=\left(7^6\right)^4\)

\(5^{40}=\left(5^{10}\right)^4\)

\(7^6=\left(7^3\right)^2>\left(5^5\right)^2\)vì \(7^2\cdot7>5^3\cdot5^2\)

\(\Rightarrow49^{12}< 5^{40}\)

\(\left(-\frac{1}{16}\right)^{100}=\left(-\left(\frac{-1}{2}\right)^4\right)^{100}\)

\(=\left(-\frac{1}{2}\right)^{400}< \left(-\frac{1}{2}\right)^{500}\)

a) Ta có:

\(\dfrac{16}{9}\)=\(\dfrac{48}{27}\)                 \(\dfrac{24}{13}=\dfrac{48}{26}\)

Vì 27>26

➝\(\dfrac{48}{27}>\dfrac{48}{26}hay\dfrac{16}{9}>\dfrac{24}{13}\)

So sánh:

a) 16/9 và 24/13 

 Ta có \(\dfrac{16}{9}=\dfrac{208}{117}\) và \(\dfrac{24}{13}=\) \(\dfrac{216}{117}\)

\(\Rightarrow\dfrac{216}{117}>\dfrac{208}{117}\Rightarrow\dfrac{24}{13}>\dfrac{16}{9}\)

b) 27/82 và 26/75

Ta có \(\dfrac{27}{82}\approx0,33\) và \(\dfrac{26}{75}\approx0,35\)

\(\Rightarrow9,35>0,33\Rightarrow\dfrac{26}{75}>\dfrac{27}{82}\)

a) Ta có: \(\dfrac{16}{9}=\dfrac{16\cdot13}{9\cdot13}=\dfrac{208}{117}\)

\(\dfrac{24}{13}=\dfrac{24\cdot9}{13\cdot9}=\dfrac{216}{117}\)

mà \(\dfrac{208}{117}< \dfrac{216}{117}\)

nên \(\dfrac{16}{9}< \dfrac{24}{13}\)

Toán 6 ? 

Ta có : 

\(\left(-\frac{1}{16}\right)^{100}=\left(\frac{1}{16}\right)^{100}=\frac{1}{16^{100}}\)

\(\left(-\frac{1}{2}\right)^{500}=\left(\frac{1}{2}\right)^{500}=\frac{1}{2^{500}}=\frac{1}{\left(2^4\right)^{125}}=\frac{1}{16^{125}}\)

Do \(\frac{1}{16^{100}}>\frac{1}{16^{125}}\left(16^{100}< 16^{125}\right)\)

\(\Rightarrow\left(-\frac{1}{16}\right)^{100}>\left(-\frac{1}{.2}\right)^{500}\)

Vậy ...

a) \(\left(-\frac{1}{2}\right)^{500}=\left[\left(-\frac{1}{2}^5\right)^{100}\right]=\left(\frac{-1}{32}\right)^{100}\)

Vì \(\left(-\frac{1}{16}\right)^{100}\) > \(\left(\frac{-1}{32}\right)^{100}\) nên \(\left(-\frac{1}{16}\right)^{100}>\left(-\frac{1}{2}\right)^{500}\)

b) Câu này mk ko bt

Bạn thông cảm

Câu a:

ta có: (-1/16)^100=(-1)^100/16^100=1/(2^4)^100=1/2^400     (1)

          (-1/2)^500=(-1)^500/2^500=1/2^500                              (2)

So sánh (1)và (2) ta thấy 2^400<2^500   => 1/2^400>1/2^500

=>(-1/16)^100>(-1/2)^500     (đpcm)

b,                                                     Bài giải

\(\left(-32\right)^9=\left(-16\cdot2\right)^9=\left(-16\right)^9\cdot2^9\)

\(\left(-16\right)^{13}=\left(-16\right)^9\cdot\left(-16\right)^4=\left(-16\right)^9\cdot\left[\left(-2\right)^4\right]^4=\left(-16\right)^9\cdot\left(-2\right)^{16}=\left(-16\right)^9\cdot2^{16}\)

Vì \(2^9< 2^{16}\) nên \(\left(-32\right)^9>\left(-16\right)^{13}\)