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\(a=2^{100}=\left(2^4\right)^{25}=16^{25}\)
\(b=3^{75}=\left(3^3\right)^{25}=27^{25}\)
\(c=5^{50}=\left(5^2\right)^{25}=25^{25}\)
Vì \(16^{25}< 25^{25}< 27^{25}\)
\(\Rightarrow a< c< b\)
\(a=2^{100},b=3^{75},c=5^{50}\\ \Rightarrow a=30^{85},b=30^{65},c=30^{44}\\ \Rightarrow a>b>c\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(2^{100}=\left(2^4\right)^{25}=16^{25}\)
\(3^{75}=\left(3^3\right)^{25}=27^{25}\)
\(5^{50}=\left(5^2\right)^{25}=25^{25}\)
Do \(16^{25}< 25^{25}< 27^{25}\)
\(\Rightarrow2^{100}< 5^{50}< 3^{75}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta co : 275 va 350
=> 275=(215)5=3276685 (1)
=> 350=(310)5=590495 (2)
Tu (1) va (2) suy ra 275>350
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: 50540 = 502.270 = 100270
Vì 100270 và 100450 đều có chung cơ số là 100 mà 270 < 450 nên 100270 < 100540.
Vậy 50540 < 100450.
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\(\frac{2}{3}^{50}=\frac{2}{3}^{45}x\frac{2}{3}^5\)
\(\frac{2}{3}^5=\frac{2}{3}.\frac{2}{3}.\frac{2}{3}.\frac{2}{3}.\frac{2}{3}=\frac{32}{243}\)
Đến đây bạn tự làm nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Ta có: \(\left(\dfrac{1}{2}\right)^{300}=\left[\left(\dfrac{1}{2}\right)^3\right]^{100}=\left(\dfrac{1}{8}\right)^{100}\)
\(\left(\dfrac{1}{3}\right)^{200}=\left[\left(\dfrac{1}{3}\right)^2\right]^{100}=\left(\dfrac{1}{9}\right)^{100}\)
=> \(\left(\dfrac{1}{8}\right)^{100}>\left(\dfrac{1}{9}\right)^{100}\)=> \(\left(\dfrac{1}{2}\right)^{300}>\left(\dfrac{1}{3}\right)^{200}\)
b, Ta có: \(\left(\dfrac{1}{3}\right)^{75}=\left[\left(\dfrac{1}{3}\right)^3\right]^{25}=\left(\dfrac{1}{27}\right)^{25}\)
\(\left(\dfrac{1}{5}\right)^{50}=\left[\left(\dfrac{1}{5}\right)^2\right]^{25}\)\(=\left(\dfrac{1}{25}\right)^{25}\)
Do \(\left(\dfrac{1}{27}\right)^{25}< \left(\dfrac{1}{25}\right)^{25}=>\left(\dfrac{1}{3}\right)^{75}< \left(\dfrac{1}{5}\right)^{50}\)
Kiểm tra lại bài nhé, học tốt!!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a=2^{100}=\left(2^4\right)^{25}=16^{25}\)
\(b=3^{75}=\left(3^3\right)^{25}=27^{25}\)
\(c=5^{50}=\left(5^2\right)^{25}=25^{25}\)
Vì: \(16^{25}< 25^{25}< 27^{25}\Rightarrow2^{100}< 5^{50}< 3^{75}\Rightarrow a< c< b\)
tíc mình nha
so sánh các số a,b,c
a=2100
b=375
c=550
\(=2^{100}=\left(2^{20}\right)^5\)
\(3^{75}=\left(3^{15}\right)^5\)
\(5^{50}=\left(5^{10}\right)^5\)
Ta có :
( -2 )100 = [( -2 )4 ]25 = 1625 (1)
375 = ( 33 )25 = 2725 (2)
550 = ( 52 )25 = 2525 (3)
Từ (1) ; (2) và (3) => ( -2 )100 < 550 < 375
Giải thích các bước giải:
a)2^100=(2^4)^25=16^25;3^75=(3^3)^25=9^25;5^50=25^25
vì 9^25<16^25<25^25=>3^75<2^100<5^50
b)10^30=(10^3)^10=1000^10
mà 8^10<1000^10
=>10^30>8^10
c)3^40=81^10;37^20=1369^10
vì 15^10<81^10<1369^10
=>15^10<3^40<37^20