Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{3^{93}+3^{90}}{3^{17}.3^{73}}=\frac{3^{93}+3^{17}.3^{73}}{3^{17}.3^{73}}=3^{93}\)
a) A = 5 + 52 + 53 + ... + 58
\(\Rightarrow\) 2A = 52 + 53 + 54 + ... + 59
\(\Rightarrow\) 2A - A = (52 + 53 + 54 + ... + 59) - (5 + 52 + 53 + ... + 58)
\(\Rightarrow\) A = 59 - 5 = 1 953 125 - 5 = 1 953 120
Vì 1 953 120 \(⋮\) 30 nên A \(⋮\) 30
\(\Rightarrow\) ĐPCT
\(a.\frac{2^{78}+2^{79}+2^{80}}{2^{77}+2^{76}+2^{75}}=2+2^3+2^5=2+8+32=42\)
chúc bạn học tốt
\(A=1+2^2+2^4+2^6+...+2^{100}\)
\(4A=2\left(1+2^2+2^4+2^6+...+2^{100}\right)=2+2^4+2^6+2^8+...+2^{100}+2^{102}\)
\(4A-A=\left(2^2+2^4+2^6+2^8+...+2^{100}+2^{102}\right)-\left(1+2^2+2^4+...+2^{100}\right)\)
\(3A=2^{102}-1\)
\(A=\frac{2^{102}-1}{3}\)
\(B=2+2^3+2^5+2^7+...+2^{1001}\)
\(4B=2^3+2^5+2^7+...+2^{1001}+2^{1003}\)
\(4B-B=\left(2^3+2^5+2^7+...+2^{1001}+2^{1003}\right)-\left(2+2^3+2^5+...+2^{1001}\right)\)
\(3B=2^{1003}-2\)
\(B=\frac{2^{1003}-2}{3}\)
\(\frac{5^{56}+5^7}{5^{49}+1}=\frac{5^7\left(5^{49}+1\right)}{5^{49}+1}=5^7\)
\(\frac{5^{56}+5^7}{5^{49}+1}=\frac{5^5+5^7}{1}=5^5+5^7=3125+78125=81250\)