Question

9-x8/7-[-7/8]

2x cộng 1/2=7/9

3/4-6x=7/13

giúp mik nhanh nhé

Answer 1

\(9-x=\dfrac{8}{7}-\left(-\dfrac{7}{8}\right)\) -> Đề bài như này đúng ko?

\(9-x=\dfrac{113}{56}\)

\(x=9-\dfrac{113}{56}\)

\(x=\dfrac{391}{56}\)

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\(2x+\dfrac{1}{2}=\dfrac{7}{9}\)

\(2x=\dfrac{7}{9}-\dfrac{1}{2}\)

\(2x=\dfrac{5}{18}\)

\(x=\dfrac{5}{18}:2\)

\(x=\dfrac{5}{36}\)

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\(\dfrac{3}{4}-6x=\dfrac{7}{13}\)

\(6x=\dfrac{3}{4}-\dfrac{7}{13}\)

\(6x=\dfrac{11}{52}\)

\(x=\dfrac{11}{52}:6\)

\(x=\dfrac{11}{312}\)

Answer 2

Đề câu `1` chưa rõ bạn xem lại

`@ 2x + 1/2 =7/9`

`2x=7/9-1/2`

`2x=14/18-9/18`

`2x=5/18`

`x=5/18:2`

`x=5/18 xx 1/2`

`x=5/2`

`@ 3/4-6x=7/13`

`6x=3/4-7/13`

`6x=11/52`

`x=11/52:6`

`x=11/52 xx 1/6`

`x=11/312`