Bạn chỉ giùm mình từng bước nha, cảm ơn
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Mọi người giải giúp mình nha, xin cảm ơn
\(\frac{-2011}{2012}:\left\{\frac{1999}{2011}-\frac{2011}{2012}\right\}+\frac{1999}{2011}:\left\{\frac{1999}{2011}-\frac{2011}{2012}\right\}\)
Rút gọn \(\left(-\frac{2011}{2012}\right)\):\(\left(\frac{1999}{2011}-\frac{2011}{2012}\right)+\frac{1999}{2011}\):\(\left(-\frac{2011}{2012}+\frac{1999}{2011}\right)\)
\(\frac{-2011}{2012}\): (\(\frac{1999}{2011}\)-\(\frac{2011}{2012}\)) + \(\frac{1999}{2011}\):(\(\frac{-2011}{2012}\)+\(\frac{1999}{2011}\))
Tính nhanh:
\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)
Tính nhanh: \(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)
Tính Nhanh:\(\frac{1999}{2011}-\frac{2011}{1999}-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)
tính nhanh
\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)\)-\(\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)
tính nhanh
\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)
Tìm x biết:
\(\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2012}+\frac{1}{2013}\right)\cdot x=\frac{2012}{1}+\frac{2011}{2}+\frac{2010}{3}+...+\frac{2}{2011}+\frac{1}{2012}\)