7/4-yx5/6=1/2+1/3

7/4-yx5/6=5/6

yx5/6=7/4-5/6=11/12

y=11/12:5/6=11/10

Dấu nhân là chữ x trong bàn phím nhé bạn

a: \(y\times4\frac{7}{12}=6\frac14\)

=>\(y\times\frac{55}{12}=\frac{25}{4}\)

=>\(y=\frac{25}{4}:\frac{55}{12}=\frac{25}{4}\times\frac{12}{55}=\frac{3\times5}{11}=\frac{15}{11}\)

b: \(y:3\frac78=5\frac12\)

=>\(y:\frac{31}{8}=\frac{11}{2}\)

=>\(y=\frac{11}{2}\times\frac{31}{8}=\frac{341}{16}\)

c: \(6\frac17:y=5\frac25\)

=>\(\frac{43}{7}:y=\frac{27}{5}\)

=>\(y=\frac{43}{7}:\frac{27}{5}=\frac{43}{7}\times\frac{5}{27}=\frac{215}{189}\)

a, \(\frac{2}{5}\)+ y = 1

                y = 1 - \(\frac{2}{5}\)

                y = \(\frac{3}{5}\)

b, \(\frac{6}{8}\)- y = \(\frac{3}{5}\)

               y = \(\frac{6}{8}\)- \(\frac{3}{5}\)

               y = \(\frac{3}{20}\)

c, y : 6 = \(\frac{7}{4}\)

         y = \(\frac{7}{4}\)x 6

         y = \(\frac{21}{2}\)

d, y - \(\frac{1}{3}\)= 5 x \(\frac{2}{3}\)

    y - \(\frac{1}{3}\)= \(\frac{10}{3}\)

           y      = \(\frac{10}{3}\)+ \(\frac{1}{3}\)

           y      = \(\frac{11}{3}\)

a,2/5 + y = 1

            y = 1 - 2/5

            y = 3/5

b, 6/8 - y = 3/5

            y = 6/8 - 3/5

            y = 3/10

c, y / 6 = 7/4 

         y = 7/4 * 6

         y = 15/2

d, y - 1/3 = 5 * 2/3

    y - 1/3 = 10/3

            y = 10/3 + 1/3

            y = 11/3

\(a,y+\dfrac{2}{3}=\dfrac{5}{2}\)

\(y=\dfrac{5}{2}-\dfrac{2}{3}\)

\(y=\dfrac{15}{6}-\dfrac{4}{6}\)

\(y=\dfrac{11}{6}\)

\(b,3\dfrac{4}{5}-y=\dfrac{18}{5}\)

\(y=3\dfrac{4}{5}-\dfrac{18}{5}\)

\(y=\dfrac{19}{5}-\dfrac{18}{5}\)

\(y=\dfrac{1}{5}\)

\(c,y-4\dfrac{5}{6}=2\dfrac{1}{6}+\dfrac{5}{6}\)

\(y-\dfrac{29}{6}=\dfrac{13}{6}+\dfrac{5}{6}\)

\(y-\dfrac{29}{6}=\dfrac{18}{6}\)

\(y=\dfrac{18}{6}+\dfrac{29}{6}\)

\(y=\dfrac{47}{6}\)

7/4-y x 5/6 = 1/2+1/3

7/4-y x 5/6=5/6

      y x 5/6=7/4-5/6

      y x 5/6=11/12

               y=11/12 : 5/6

               y=11/10

\(\frac{7}{4}-y\times\frac{5}{6}=\frac{1}{2}+\frac{1}{3}\)

\(\frac{7}{4}-y\times\frac{5}{6}=\frac{5}{6}\)

\(\frac{7}{4}-y=\frac{5}{6}\div\frac{5}{6}\)

\(\frac{7}{4}-y=1\)

\(y=1+\frac{7}{4}\)

\(y=\frac{11}{4}\)