Question

a]x + 1/2 =5/7

b]25/7 -x =8/9

c]15/11*x =5/3

đ]x x5/12 =8/9

 

Answer 1

a x+\(\frac{1}{2}\)=\(\frac{5}{7}\)

x=\(\frac{5}{7}\)-\(\frac{1}{2}\)

x=\(\frac{3}{14}\)

b \(\frac{25}{7}\)-x=\(\frac{8}{9}\)

x=\(\frac{25}{7}\)-\(\frac{8}{9}\)

x=\(\frac{169}{43}\)

c \(\frac{15}{11}\)*x=\(\frac{5}{3}\)

x=\(\frac{5}{3}\):\(\frac{15}{11}\)

x=\(\frac{11}{9}\)

D x*\(\frac{5}{12}\)=\(\frac{8}{9}\)

x=\(\frac{8}{9}\):\(\frac{5}{12}\)

x=\(\frac{32}{15}\)

Answer 2

a) \(x+\frac{1}{2}=\frac{5}{7}\)

\(x=\frac{5}{7}-\frac{1}{2}\)

\(x=\frac{10}{14}-\frac{7}{14}\)

\(x=\frac{3}{14}\)

b) \(\frac{25}{7}-x=\frac{8}{9}\)

\(x=\frac{25}{7}-\frac{8}{9}\)

\(x=\frac{225}{63}-\frac{56}{63}\)

\(x=\frac{169}{63}\)

c) \(\frac{15}{11}\cdot x=\frac{5}{3}\)

\(x=\frac{5}{3}:\frac{15}{11}\)

\(x=\frac{5}{3}\cdot\frac{11}{15}\)

\(x=\frac{11}{9}\)

d) \(x\cdot\frac{5}{12}=\frac{8}{9}\)

\(x=\frac{8}{9}:\frac{5}{12}\)

\(x=\frac{8}{9}\cdot\frac{12}{5}\)

\(x=\frac{32}{15}\)

Answer 3

a) x + 1/2 = 5/7

  x           = 5/7 - 1/2 

   x          =3 /14

b) 25/7 - x  =  8/9

              x = 25/7 - 8/9

              x = 169/63

c) 15/11 * x   = 5/3

            x       = 5/3 : 15/11

           x        = 11/9

d)  x * 5/12      = 8/9

     x                 = 8/9 : 5/12 

 x                      = 32/15