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( 3/4 . x + 1 ) : ( -4 ) = -1/28
<=> 3/4 . x + 1 = -1/28 . ( -4 )
<=> 3/4 . x + 1 = 1/7
<=> 3/4 . x = 1/7 - 1
<=> 3/4 . x = -6/7
<=> x = -6/7 . 4/3
<=> x = -8/7
Vậy x = -8/7
\(1,\frac{2}{3}+\frac{4}{9}+\frac{1}{5}+\frac{2}{15}+\frac{3}{2}-\frac{17}{18}\)
\(< =>\frac{4}{9}+\frac{3}{2}+\left(\frac{2}{3}+\frac{1}{5}+\frac{2}{15}\right)-\frac{17}{18}\)
\(< =>\frac{8}{18}+\frac{27}{18}+\left(\frac{10}{15}+\frac{3}{15}+\frac{2}{15}\right)-\frac{17}{18}\)
\(< =>\frac{35}{18}+1-\frac{17}{18}\)
\(< =>\frac{53}{18}-\frac{17}{18}\)
\(< =>2\)
\(2,\frac{13}{28}\cdot\frac{5}{12}-\frac{5}{28}\cdot\frac{1}{12}\)
\(< =>\left(\frac{13}{28}-\frac{5}{28}\right)\cdot\left(\frac{5}{12}-\frac{1}{12}\right)\)
\(< =>\frac{2}{7}\cdot\frac{1}{3}\)
\(< =>\frac{2}{21}\)
\(3,\frac{19}{4}\cdot\frac{15}{23}-\frac{15}{4}\cdot\frac{7}{23}+\frac{15}{4}\cdot\frac{11}{23}\)
\(< =>\frac{285}{92}-\frac{105}{92}+\frac{165}{92}\)
\(< =>\frac{15}{4}\)
=\(\left(-\dfrac{3}{7}+\dfrac{1}{4}\right)\cdot\dfrac{28}{15}\)
=\(-\dfrac{3}{7}\cdot\dfrac{28}{15}+\dfrac{1}{4}\cdot\dfrac{28}{15}\)
=\(-\dfrac{4}{5}+\dfrac{7}{15}\)
=\(-\dfrac{1}{3}\)
nếu e ko bt thì dấu .là nhân nhé !
\(\Rightarrow\) 3x/7 + 1 = 1/112
\(\Rightarrow\) 3x/7 = -111/112
\(\Rightarrow\) 3x = -111/16
\(\Rightarrow\) x = -37/16