Question

( x - 4/7) : -1/3 = 1

2/3 + 7/4 : x = 5/6

 giúp mik với

Answer 1

\(\left(x-\dfrac{4}{7}\right):-\dfrac{1}{3}=1\)
\(\Rightarrow x-\dfrac{4}{7}=1\cdot-\dfrac{1}{3}\)

\(\Rightarrow x-\dfrac{4}{7}=-\dfrac{1}{3}\)

\(\Rightarrow x=-\dfrac{1}{3}+\dfrac{4}{7}\)

\(\Rightarrow x=\dfrac{5}{12}\)

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\(\dfrac{2}{3}-\dfrac{7}{4}:x=\dfrac{5}{6}\)

\(\Rightarrow\dfrac{7}{4}:x=\dfrac{2}{3}-\dfrac{5}{6}\)

\(\Rightarrow\dfrac{7}{4}:x=-\dfrac{1}{6}\)

\(\Rightarrow x=\dfrac{7}{4}:-\dfrac{1}{6}\)

\(\Rightarrow x=-\dfrac{21}{2}\)

Answer 2

(x - 4/7) : (-1/3) = 1

x - 4/7 = -1/3

x = -1/3 +4/7

x = 5/21

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2/3 + 7/4 : x = 5/6

7/4 : x = 5/6 - 2/3

7/4 : x = 1/6

x = 7/4 : 1/6

x = 21/2

Answer 3

a) ( x - 4/7) : (-1/3) = 1

      x- 4/7                = 1 . (-1/3)

         x                     =-1/3 + 4/7

         x                     =   5/12

b) 2/3 + 7/4 : x = 5/6

              7/4: x  = 2/3 -5/6

                     x   = 7/4  : (-1/6 )

                     x    =    -21/2