5PHẦN7 CHIA X = 1PHẦN6 + 4PHẦN5
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\(-\frac{5}{7}\cdot\frac{5}{13}-\frac{5}{7}\cdot\frac{8}{13}+\frac{5}{7}\)
\(=\frac{5}{7}\left(-\frac{5}{13}-\frac{8}{13}+1\right)\)
\(=\frac{5}{7}\cdot0\)
\(=0\)
\(\left|x-\frac{1}{3}\right|+\frac{4}{5}=\left|\left(-\frac{3}{2}\right)+\frac{2}{5}\right|\)
\(\left|x-\frac{1}{3}\right|+\frac{4}{5}=\frac{11}{10}\)
\(\left|x-\frac{1}{3}\right|=\frac{3}{10}\)
\(\Rightarrow\hept{\begin{cases}x-\frac{1}{3}=\frac{3}{10}\\x-\frac{1}{3}=-\frac{3}{10}\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{19}{30}\\x=\frac{1}{30}\end{cases}}}\)
Vậy..........
A = 19\(\dfrac{1}{4}\) + \(\dfrac{1}{2\dfrac{1}{3}}\) + 5,75 - \(\dfrac{1}{6}\) + 74
A = \(\dfrac{77}{4}\) + \(\dfrac{1}{\dfrac{7}{3}}\) + 5,75 - \(\dfrac{1}{6}\) + 74
A = \(\dfrac{77}{4}\) + \(\dfrac{3}{7}\) + \(\dfrac{23}{4}\) - \(\dfrac{1}{6}\) + 74
A = \(\dfrac{3234}{168}\) + \(\dfrac{72}{168}\) + \(\dfrac{966}{168}\) - \(\dfrac{28}{168}\) + \(\dfrac{12432}{168}\)
A = \(\dfrac{16676}{168}\)
A = \(\dfrac{4169}{42}\)
\(a,\dfrac{5}{7}-\dfrac{11}{4}\)
\(=\dfrac{20}{28}-\dfrac{77}{28}\)
\(=\dfrac{20-77}{28}\)
\(=-\dfrac{57}{28}\)
\(b,\dfrac{15}{7}:-\dfrac{18}{14}\)
\(=\dfrac{15}{7}\times\left(-\dfrac{14}{18}\right)\)
\(=\dfrac{15\times\left(-14\right)}{7\times18}=-\dfrac{210}{126}=-\dfrac{5}{3}\)
5/7 . 1/x = 29/30
=> 5.30 = 29.7x
150 = 203x
x= 150/203
\(\frac{5}{7}:x=\frac{1}{6}+\frac{4}{5}\)
\(\frac{5}{7}:x=\frac{29}{30}\)
\(x=\frac{5}{7}:\frac{29}{30}\)
\(x=\frac{150}{203}\)