=5520

5y : 3*4 +299 = 2 599

5y : 384 = 23 00

5y = 883 200

y= 176 640

 5 x y : 3 x 4 = 2599 - 299 = 2300

5 x y : 3 = 2300 : 4

5 x y : 3 = 575

5 x y = 575 x 3

5 x y = 1725

y = 1725 : 5

y = 345

a) 2015^2016+2015^2015=2015^2015 .(2015+1) =2015^2015 .2016 < 2016^2015 . 2016 =2016^2016 

Vậy 2015^2016+2015^2015< 2016^2016 

b)5^299 < 5^300 = (5^2)^150 =25^150 < 27^150 =(3^3)^150 = 3^450 <3^501

Vậy 5^299 < 3^501

\(1.\)

a, \(27^{265}\)và \(81^{199}\)

\(27^{265}=\left(3^3\right)^{265}=3^{795}\)

\(81^{199}=\left(3^4\right)^{199}=3^{796}\)

\(\Rightarrow3^{795}< 3^{796}hay27^{265}< 81^{199}\)

b, \(1024^{15}=\left(2^{10}\right)^{15}=2^{150}\)

\(128^{21}=\left(2^7\right)^{21}=2^{147}\)

\(2^{150}>2^{147}.hay.1024^{15}>128^{21}\)

a) 2015²⁰¹⁶ + 2015²⁰¹⁵ = 2015²⁰¹⁵ . 2015 + 2015²⁰¹⁵ = 2015²⁰¹⁵ . ( 2015 + 1 ) = 2015²⁰¹⁵ . 2016

2016²⁰¹⁶ = 2016²⁰¹⁵ . 2016

Vì 2015²⁰¹⁵ . 2016 < 2016²⁰¹⁵ . 2016 nên 2015²⁰¹⁶ + 2015²⁰¹⁵ < 2016²⁰¹⁶

b)  5²⁹⁹ < 5³⁰⁰ = ( 5² ) ¹⁵⁰ = 25¹⁵⁰

3⁵⁰¹ = ( 3³ ) ¹⁶⁷ = 27¹⁶⁷

Vì 25¹⁵⁰ < 27¹⁶⁷ nên 5²⁹⁹ < 3⁵⁰¹

x = 0,18 : 0,9 x 9,63 + 299

x = 0,2 x 9,63 + 299

x = 1,926 + 299

x = 300,926

tick cho may de het am voi cac ban

1/2x3 +1/3x4 +..........+ 1/ax(a+1)=299/600

=>1/2-1/3+1/3-1/4+.........+ 1/a -1/a+1=299/600

=>1/2-1/a+1=299/600

=>a-1/2a=299/600

=>a=300

300 va 926

tích mình nha các bạn

300.926

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