Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\left(\frac{1}{3}\right)^{30}.x+\left(\frac{1}{3}\right)^{31}=\left(\frac{1}{3}\right)^{32}\)
\(\left(\frac{1}{3}\right)^{30}.\left(x+\frac{1}{3}\right)=\left(\frac{1}{3}\right)^{32}\)
\(x+\frac{1}{3}=\left(\frac{1}{3}\right)^{32}:\left(\frac{1}{3}\right)^{30}\)
\(x+\frac{1}{3}=\left(\frac{1}{3}\right)^2\)
\(x+\frac{1}{3}=\frac{1}{9}\)
\(x=\frac{1}{9}-\frac{1}{3}=\frac{1}{9}-\frac{3}{9}\)
\(x=-\frac{2}{9}\)
S=1/30+1/31+1/32+1/33+...+1/59+1/60
S có 31 phân số,ta thấy:
1/30>1/62 1/31>1/62 1/32>1/62 ............ 1/60>1/62
Vậy:
S>31.1/62
S>31/62
S>1/2
Vậy S>1/2
Chúc em học tốt^^
\(1,\\ a,2< 3\Rightarrow2^{30}< 3^{30}\Rightarrow-2^{30}>-3^{30}\\ b,6^{10}=6^{2\cdot5}=\left(6^2\right)^5=36^5>35^5\left(36>35\right)\)
\(2,\\ a,\dfrac{\left(-3\right)^{10}\cdot15^5}{25^3\cdot\left(-9\right)^7}=\dfrac{3^{10}\cdot5^5\cdot3^5}{5^6\cdot3^{14}}=\dfrac{3}{5}\\ b,\left(8x-1\right)^{2x+1}=5^{2x+1}\\ \Leftrightarrow8x-1=5\\ \Leftrightarrow x=\dfrac{3}{4}\)
Bài 2:
a: Ta có: \(\dfrac{\left(-3\right)^{10}\cdot15^5}{25^3\cdot\left(-9\right)^7}\)
\(=\dfrac{-3^{10}\cdot3^5\cdot5^5}{5^6\cdot3^{14}}\)
\(=-\dfrac{3}{5}\)
b: Ta có: \(\left(8x-1\right)^{2x+1}=5^{2x+1}\)
\(\Leftrightarrow8x-1=5\)
\(\Leftrightarrow8x=6\)
hay \(x=\dfrac{3}{4}\)
(2x-5)-(\(\frac{3}{2}\) . 6x + \(\frac{3}{2}\))=4
2x -5 - 9x -\(\frac{3}{2}\) =4
2x - 9x = 4+ 5+ \(\frac{3}{2}\)
\(30A=\frac{30^{32}+30}{30^{32}+1}=\frac{30^{32}+1+29}{30^{32}+1}=1+\frac{29}{30^{32}+1}\)
\(30B=\frac{30^{33}+30}{30^{33}+1}=\frac{30^{33}+1+29}{30^{33}+1}=1+\frac{29}{30^{33}+1}\)
Vì \(\frac{29}{30^{32}+1}>\frac{29}{30^{33}+1}\) nên \(1+\frac{29}{30^{32}+1}>1+\frac{29}{30^{33}+1}\Rightarrow30A>30B\Rightarrow A>B\)
Vậy \(A>B.\)
Chúc bạn học tốt.