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\(\left(\frac{1}{9}\right)^{2015}.9^{2015}-96^2:24^2=1^{2015}-4^2=1-16=-15\)
\(16\frac{2}{7}:\left(\frac{-3}{5}\right)-28\frac{2}{7}:\left(\frac{-3}{5}\right)=\left(16\frac{2}{7}-28\frac{2}{7}\right):\left(\frac{-3}{5}\right)=-12.\frac{-5}{3}=20\)
\(\left(-2\right)^3.\left(\frac{3}{4}-0,25\right):\left(2\frac{1}{4}-1\frac{1}{6}\right)=-8.\frac{1}{2}:\frac{13}{12}=-8.\frac{1}{2}.\frac{12}{13}=\frac{-48}{13}\)
ban ơi là \(\frac{1^{2005}}{8}\)hay \(\left(\frac{1}{8}\right)^{2005}\)
1/8^2005.9^1005-96^2:24^2
=9/8^2005-4^2
den doan nay thi em chiu roi em moi hoc lop 6 thoi a
bt lm thì lm đi Hung nguyen , mình cx chưa bt làm thế nào, khó vãi
\(B=\left(\dfrac{1}{9}\right)^{2015}.9^{2015}-96^2:24^2\)
\(=\dfrac{1^{2015}.9^{2015}}{9^{2015}}-\left(2^5.3\right)^2:\left(2^3.3\right)^2\)
\(=1-2^{10}.3^2:2^6.3^2\)
\(=1-\left(2^{10}:2^6\right).\left(3^2.3^2\right)\)
\(=1-2^4.3^4=1-\left(2.3\right)^4\)
\(=1-6^4=1-1296=-1925\)
b: \(C=\dfrac{1}{7}\cdot7\cdot9-3\cdot\dfrac{4}{3}+1=9-4+1=6\)
a: \(=\left(\dfrac{1}{9}\cdot9\right)^{2015}-\left(96:24\right)^2=1-16=-15\)
\(a)=\frac{7}{25}+\frac{4}{13}-\frac{5}{2}+\frac{18}{25}-\frac{17}{13}\)
\(=1-1-\frac{5}{2}\)
\(=-\frac{5}{2}\)
Bài 1:
a) \(\left(\dfrac{1}{9}-1\right)\left(\dfrac{1}{10}-1\right)......\left(\dfrac{1}{2004}-1\right)\left(\dfrac{1}{2005}-1\right)\)
= \(\dfrac{-8}{9}.\dfrac{-9}{10}.......\dfrac{-2003}{2004}.\dfrac{-2004}{2005}\) = \(\dfrac{-8}{2005}\)
b) \(-2+\dfrac{1}{-2+\dfrac{1}{-2+\dfrac{1}{-2+3}}}\) = \(-2+\dfrac{1}{-2+\dfrac{1}{-2+\dfrac{1}{1}}}\)
= \(-2+\dfrac{1}{-2+\dfrac{1}{-1}}\) = \(-2+\dfrac{1}{-3}\) = \(\dfrac{-7}{3}\)
\(\text{Câu 1 : }\) Tính
\(\text{a) }\left(\dfrac{1}{9}-1\right)\left(\dfrac{1}{10}-1\right)...\left(\dfrac{1}{2004}-1\right)\left(\dfrac{1}{2005}-1\right)\\ =\left(1-\dfrac{9}{9}\right)\left(\dfrac{1}{10}-\dfrac{10}{10}\right)...\left(\dfrac{1}{2004}-1\right)\left(\dfrac{1}{2005}-\dfrac{2005}{2005}\right)\\ =\dfrac{-8}{9}\cdot\dfrac{-9}{10}\cdot...\cdot\dfrac{-2003}{2004}\cdot\dfrac{-2004}{2005}\\ =\dfrac{\left(-8\right)\cdot\left(-9\right)\cdot..\cdot\left(-2003\right)\cdot\left(-2004\right)}{9\cdot10\cdot...\cdot2004\cdot2005}\\ =-\dfrac{8\cdot9\cdot...\cdot2003\cdot2004}{9\cdot10\cdot...\cdot2004\cdot2005}\\ =-\dfrac{8}{2005}\)
\(-2+\dfrac{1}{-2+\dfrac{1}{-2+\dfrac{1}{-2+3}}}\\ =-2+\dfrac{1}{-2+\dfrac{1}{-2+\dfrac{1}{1}}}\\ =-2+\dfrac{1}{-2+\dfrac{1}{-1}}\\ =-2+\dfrac{1}{-3}\\ =-2+\dfrac{-1}{3}=-\dfrac{7}{3}\)
\(\left(\dfrac{1}{9}\right)^{2005}.9^{2005}-96^2:24^2=\left(\left(\dfrac{1}{9}\right)^{2005}.9^{2005}\right)-\left(96^2:24^2\right)\)
\(=\left(\dfrac{1^{2005}}{9^{2005}}.9^{2005}\right)-\left(96^2:24^2\right)=\left(1^{2005}\right)-\left(\left(4.24\right)^2:24^2\right)\)
\(=1-\left(4^2\right)=1-16=-15\)
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