Question

[Phương Trần]

1 . thuc hien phep tinh

a)                    5^{2017 :} (5²⁰¹⁵ nhan 16 + 5²⁰¹⁵ nhan 9) 

2 .tim x biet :

b)                     4 nhan ( 2017 - 16 x ) = 10² - 2⁵   

Answer 1

[Tuii cũg dễx thưng màk]

Ta có :

\(5^{2017}:\left(5^{2015}.16+5^{2015}.9\right)\)\(=5^{2017}:\left[5^{2015}\left(16+9\right)\right]\)

\(=5^{2017}:\left[5^{2015}.5^2\right]=1\)

2/ \(4.\left(2017-16x\right)=10^2-2^5\)

\(\Rightarrow4.2017-4.4^2x=100-25\)

\(\Rightarrow8068-4^3.x=75\)

\(\Rightarrow64x=8068-75\)

\(\Rightarrow64x=7993\)

\(\Rightarrow x=\frac{7993}{64}\)