Question

Bài 1: 

a) 8/7 - 5/11 : 8       b) 1 + 2/9 : 7/3 - 10/7      c) 11/3 - 2 : 7/3 + 4

Bài 2: 

a) 9/4 - x = 5/11 : 1/2               b) 2/9 : x = 7/3 - 10/7

Bài 3: 

                \(\dfrac{1999x1998-1}{1997x1999+1998}\)           

Answer 1

1:

a: =8/7-5/88=669/616

b: \(=1+\dfrac{2}{9}\cdot\dfrac{3}{7}-\dfrac{10}{7}=1+\dfrac{2}{21}-\dfrac{10}{7}\)

\(=\dfrac{21+2-30}{21}=\dfrac{-7}{21}=\dfrac{-1}{3}\)

c: \(=\dfrac{11}{3}-\dfrac{6}{7}+4=\dfrac{77-18+84}{21}=\dfrac{143}{21}\)

Bài 2:

a: =>9/4-x=5/11*2=10/11

=>x=9/4-10/11=59/44

b: =>2/9:x=19/21

=>x=2/9:19/21=14/57