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7/3 - 2/3 . x = 7/4

       2/3 . x = 7/3 - 7/4

       2/3 . x =  28/12 - 21/ 12

       2/3 . x =  7/12

              x =  7/12 : 2/3

              x = 7/12 . 3/2

              x =  21/ 24

              x = 7/8

 vậy x = 7/8

\(\frac{7}{3}-\frac{2}{3}x=-1\frac{3}{4}\)

\(\frac{7}{3}-\frac{2}{3}x=-\frac{7}{4}\)

\(\frac{2}{3}x=\frac{7}{3}-\left(-\frac{7}{4}\right)\)

\(\frac{2}{3}x=\frac{7}{3}+\frac{7}{4}\)

\(\frac{2}{3}x=\frac{49}{12}\)

\(x=\frac{49}{12}:\frac{2}{3}\)

\(x=\frac{49}{12}\cdot\frac{3}{2}\)

\(x=\frac{49}{8}\)

nếu thấy đúng thì k cho mh nhahoàng mộc miên123___

a )  \(-\frac{3}{7}.\frac{3}{11}+-\frac{3}{7}.\frac{8}{11}+1\frac{3}{7}\)

\(=-\frac{3}{7}.\left(\frac{3}{11}+\frac{8}{11}\right)+\frac{10}{7}\)

\(=-\frac{3}{7}.\frac{11}{11}+\frac{10}{7}\)

\(=-\frac{3}{7}.1+\frac{10}{7}\)

\(=\frac{10}{7}\)

b )   \(75\%.10,5=\frac{3}{4}.10,5=7,875\)

c )  \(5-3.\left(\left|-4\right|-30:15\right)\)

\(=5-3.\left(4-2\right)\)

\(=5-3.2\)

\(=5-6\)

\(=-1\)

d )  \(-\frac{5}{7}.\frac{2}{11}+-\frac{5}{7}.\frac{9}{11}+1\frac{5}{7}\)

\(=-\frac{5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{12}{7}\)

\(=-\frac{5}{7}.1+\frac{12}{7}\)

\(=\frac{7}{7}\)

\(=1\)

Chúc bạn học tốt !!! 

\(\dfrac{1}{3}\cdot x+\dfrac{1}{6}=3\dfrac{1}{2}\)

\(\dfrac{1}{3}\cdot x+\dfrac{1}{6}=\dfrac{7}{2}\)

\(\dfrac{1}{3}\cdot x=\dfrac{7}{2}-\dfrac{1}{6}\)

\(\dfrac{1}{3}\cdot x=\dfrac{10}{3}\)

     \(x=\dfrac{10}{3}\div\dfrac{1}{3}\)

     \(x=10\)

a: \(1\dfrac{3}{4}=1+\dfrac{3}{4}\)

b: \(3\dfrac{5}{9}=3+\dfrac{5}{9}\)

c: \(1\dfrac{9}{10}=1+\dfrac{9}{10}\)

d: \(3\dfrac{25}{20}=3+\dfrac{5}{4}\)

e: \(=2\dfrac{55}{30}=2+\dfrac{11}{6}\)

a) \(6.\left(-3\right)+\left(-4\right).\left(-5\right)=\left(-18\right)+20=2\)

b) \(\dfrac{2}{5}-\dfrac{1}{3}=\dfrac{6}{15}-\dfrac{5}{15}=\dfrac{1}{15}\) ( cái này hình như k chuyển dc thành hỗn số bn à)

c) \(\dfrac{-3}{5}.\dfrac{4}{7}+\dfrac{3}{7}.\dfrac{-3}{5}+\dfrac{3}{5}\)\(=\dfrac{-3}{5}.\dfrac{4}{7}+\dfrac{3}{7}.\dfrac{-3}{5}+\left(-1\right).\dfrac{-3}{5}\)

\(=\dfrac{-3}{5}.\left(\dfrac{4}{7}+\dfrac{3}{7}+\left(-1\right)\right)=\dfrac{-3}{5}.0=0\)

Chúc bn học tốt

\(a,6.\left(-3\right)+\left(-4\right).\left(-5\right)\)

\(=-18+20\)

\(=2\)

\(b,2\dfrac{3}{5}-1\dfrac{2}{3}\)

\(=\dfrac{13}{5}-\dfrac{5}{3}\)

=\(\dfrac{14}{15}\)

\(c,\dfrac{-3}{5}.\dfrac{4}{7}+\dfrac{3}{7}.\dfrac{-3}{5}+\dfrac{3}{5}\)

\(=\dfrac{-3}{5}.\left[\dfrac{4}{7}+\dfrac{3}{7}+\left(-1\right)\right]\)

\(=\dfrac{-3}{5}.0\)

\(=0\)