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\(M=1-\dfrac{5}{14}-\dfrac{5}{84}-\dfrac{5}{204}-\dfrac{5}{374}\)
\(=\dfrac{84-30-5}{84}-\dfrac{5}{204}-\dfrac{5}{374}\)
\(=\dfrac{49}{84}-\dfrac{5}{204}-\dfrac{5}{374}\)
\(=\dfrac{7}{12}-\dfrac{5}{204}-\dfrac{5}{374}\)
\(=\dfrac{7\cdot17-5}{204}-\dfrac{5}{374}=\dfrac{19}{34}-\dfrac{5}{374}=\dfrac{204}{374}=\dfrac{6}{11}\)
\(M=1-\frac{5}{\sqrt{196}}-\frac{5}{\left(2\sqrt{21}\right)^2}-\frac{\sqrt{25}}{204}-\frac{\left(\sqrt{5}\right)^2}{374}\)
\(=1-\frac{5}{14}-\frac{5}{84}-\frac{5}{204}-\frac{5}{374}\left(\text{(}2\sqrt{21}\text{)}^2=2^2.21=84\right)\)
\(=1-\frac{5}{2.7}-\frac{5}{7.12}-\frac{5}{12.17}-\frac{5}{17.22}\)
\(=1-\frac{1}{2}+\frac{1}{7}-\frac{1}{7}+\frac{1}{12}-\frac{1}{12}+\frac{1}{17}-\frac{1}{17}+\frac{1}{22}\)
\(=1-\frac{1}{2}+\frac{1}{22}\)
\(=\frac{22-11+1}{22}=\frac{12}{22}=\frac{6}{11}\)
Vậy M = 6/11.
=(7/14- 13/14):5/7-(-2/21+3/21):5/7
=-6/14* 7/5 -1/21*7/5
=(-6/14-1/21)*7/5
=-10/21*7/5
=-2/3
MÌNH CHẮC CHẮN VỚI BẠN LUÔN!!!!
\(\left(\frac{1}{2}-\frac{13}{14}\right):\frac{5}{7}-\left(-\frac{2}{21}+\frac{1}{7}:\frac{5}{7}\right)\)
\(=\left(\frac{7}{14}-\frac{13}{14}\right):\frac{5}{7}-\left(-\frac{2}{21}+\frac{3}{21}\right):\frac{5}{7}\)
\(=-\frac{6}{14}\times\frac{7}{5}-\frac{1}{21}\times\frac{7}{5}\)
\(=\left(-\frac{6}{14}-\frac{1}{21}\right)\times\frac{7}{5}\)
\(=-\frac{10}{21}\times\frac{7}{5}\)
\(=-\frac{2}{3}\)
\("k\)\(nha"\)
=0.54545454545 nha