Tính nhanh : -5/11.7/11-5/11.8/11+-6/11
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FF
18 tháng 8 2016
\(\frac{5^{11}.7^{12}+5^{11}.7^{11}}{5^{12}.7^{12}+9.5^{11}.7^{11}}=\frac{5^{11}.7^{11}\left(7+1\right)}{5^{11}.7^{11}\left(5.7+9\right)}=\frac{8}{44}=\frac{2}{11}\)
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5 tháng 6 2015
\(\frac{5^{11}.7^{12}+5^{11}.7^{11}}{5^{12}.7^{12}+9.5^{11}.7^{11}}=\frac{5^{11}.7^{11}\left(7+1\right)}{5^{11}.7^{11}\left(5.7+9\right)}=\frac{8}{44}=\frac{2}{11}\)
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ET
0
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\(\frac{-5}{11}\times\frac{7}{11}-\frac{5}{11}\times\frac{8}{11}+\frac{-6}{11}\)
\(=\left(\frac{-5}{11}+\frac{5}{11}\right)\times\left(\frac{8}{11}-\frac{7}{11}\right)\times\frac{-6}{11}\)
\(=0\times\frac{1}{11}\times\frac{-6}{7}\)
\(=0.\)