Question

Tìm x biết:
a) \(x+\dfrac{1}{3}=\dfrac{3}{4}\) ;                          b) \(x-\dfrac{2}{5}=\dfrac{5}{7};\)
c) \(-x-\dfrac{2}{3}=-\dfrac{6}{7}\) ;                   d) \(\dfrac{4}{7}-x=\dfrac{1}{3}\)                                   

Answer 1

a) x + => x =

b) x - => x =

c) -x - = =>

d) =>

Answer 2

Lời giải:

a) x + => x =

b) x - => x =

c) -x - = =>

d) =>

Answer 3

x +1/3

Answer 4

a) x+\(\dfrac{1}{3}\)=\(\dfrac{3}{4}\) b)x-\(\dfrac{2}{5}\)=\(\dfrac{5}{7}\)

x =\(\dfrac{3}{4}\)-\(\dfrac{1}{3}\) x =\(\dfrac{5}{7}\)+\(\dfrac{2}{5}\)

x =\(\dfrac{5}{12}\) x =\(\dfrac{39}{35}\)

Vậy x=\(\dfrac{5}{12}\) Vậy x=\(\dfrac{39}{35}\)

c)-x-\(\dfrac{2}{3}\)=\(\dfrac{-6}{7}\) d)\(\dfrac{4}{7}\) -x=\(\dfrac{1}{3}\)

-x =\(\dfrac{-6}{7}\)-\(\dfrac{2}{3}\) x =\(\dfrac{4}{7}\)-\(\dfrac{1}{3}\)

-x =\(\dfrac{-4}{21}\) x =\(\dfrac{5}{21}\)

=>x =\(\dfrac{4}{21}\) Vậy x=\(\dfrac{5}{21}\)

Vậy x =\(\dfrac{4}{21}\)

Answer 5

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