Question

Tìm x:
\(\dfrac{3}{4}-x=\dfrac{1}{8}\)

Tính bằng cách thuận tiện:
      \(\dfrac{2}{5}\)x\(\dfrac{9}{4}-\dfrac{5}{4}\)x\(\dfrac{2}{5}\)

Answer 1

x=3/4-1/8

x=6/8-1/8

x=6/8

=2/5.(9/4-5/4)

=2/5.1

=2/5

Answer 2

\(x=\dfrac{3}{4}-\dfrac{1}{8}\)\(\)

\(x=\dfrac{6}{8}-\dfrac{1}{8}\)

\(x=\dfrac{5}{8}\)

 

\(=\dfrac{2}{5}x\left(\dfrac{9}{4}-\dfrac{5}{4}\right)\)

\(=\dfrac{2}{5}x1\)

\(=\dfrac{2}{5}\)

Answer 3

`x=3/4-1/8`

`x=5/8`

------------------------

`=2/5xx(9/4+5/4)`

`=2/5xx7/2=5/7`

Answer 4

`3/4-x=1/8`

`x=3/4-1/8`

`x=6/8-1/8=5/8`

_____________________________________

`2/5xx9/4-5/4xx2/5=2/5xx(9/4-5/4)=2/5xx4/4=2/5`

Answer 5

3/4-x=1/8
      x=3/4-1/8
      x=6/8-1/8
      x=5/8
Vậy x=5/8
2/5x9/4-5/4x2/5
=2/5.(9/4-5/4)
=2/5.1
=2/5