Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(B=\left(3+3^3+3^5\right)+...+\left(3^{27}+3^{28}+3^{29}\right)\)
\(=1.\left(3+3^3+3^5\right)+3^6.\left(3+3^3+3^5\right)+...+3^{26}.\left(3+3^3+3^5\right)\)
\(=\left(3+3^3+3^5\right)\left(1+3^6+...+3^{26}\right)\)
\(=\left(1+3^6+...+3^{26}\right).273\)chia hết cho 273.
a, \(25^8:5^3=5^{16}:5^3=5^{13}\)
b, \(8^9:2^4=2^{27}:2^4=2^{23}\)
258 : 53=( 52)8:53=516:53=513
89 : 24=(23)9 : 24=227:24=223
1.
Có : 5^299 < 5^300 = (5^2)^150 = 25^150
3^501 > 3^450 = (3^3)^150 = 27^150
Mà 25^150 < 27^150 => 5^299 < 3^501
Tk mk nha
Bài giải
a) Ta có :
\(43^{43}-17^{17}=43^{40}\cdot43^3-17^{16}\cdot17=\left(43^4\right)^{10}\cdot43^3-\left(17^4\right)^4\cdot17=\overline{\left(...1\right)}^{10}\cdot\overline{\left(...3\right)}^3-\overline{\left(...1\right)}^4\cdot17\)
\(=\overline{\left(...1\right)}\cdot\overline{\left(...7\right)}-\overline{\left(...7\right)}=\overline{\left(...7\right)}-\overline{\left(...7\right)}=\overline{\left(...0\right)}\text{ }⋮\text{ }10\)
\(\Rightarrow\text{ ĐPCM}\)
\(A=5+5^2+...+5^8\)
\(=\left(5+5^2\right)+\left(5^3+5^4\right)+...+\left(5^7+5^8\right)\)
\(=1.\left(5+5^2\right)+5.\left(5+5^2\right)+...+5^6.\left(5+5^2\right)\)
\(=\left(1+5+...+5^6\right)\left(5+5^2\right)\)
\(=\left(1+5+...+5^6\right).30\)chia hết cho 30.
\(A=5+5^2+5^3+........+5^8\)
\(=\left(5+5^2\right)+\left(5^3+5^4\right)+...+\left(5^7+5^8\right)\)
\(=1.\left(5+5^2\right)+5.\left(5+5^2\right)+...+5^6.\left(5+5^2\right)\)
\(=1.30+5.30+...+5^6.30\)
\(=\left(1+5+...+5^6\right)30\text{chia hết cho 30.}\)