Question

Đã trả lời bởi chuyên gia

Answer 1

Bài 1:

$f . \frac{- 5}{13} - (\frac{3}{5} + \frac{3}{13} - \frac{4}{10}) = \frac{- 5}{13} - \frac{3}{13} + \frac{4}{10} - \frac{3}{5} = \frac{- 8}{13} + \frac{4}{10} - \frac{6}{10} = \frac{- 8}{13} + \frac{- 2}{10} = \frac{- 8}{13} - \frac{1}{5} = \frac{- 53}{65} g . (\frac{1}{9} - \frac{9}{17}) + \frac{3}{6} - (\frac{12}{17} - \frac{1}{2}) + \frac{5}{9} = \frac{1}{9} + \frac{5}{9} - (\frac{9}{17} + \frac{12}{17}) + \frac{3}{6} + \frac{1}{2} = \frac{6}{9} - \frac{21}{17} + \frac{1}{2} + \frac{1}{2} = \frac{6}{9} - \frac{21}{17} + 1 = \frac{22}{51}$

Bài 2:

$a . \frac{x}{4} - \frac{3}{7} + \frac{2}{5} = \frac{31}{140} \Rightarrow \frac{x}{4} = \frac{31}{140} + \frac{3}{7} - \frac{2}{5} \Rightarrow \frac{x}{4} = \frac{31}{140} + \frac{60}{140} - \frac{56}{140} \Rightarrow \frac{x}{4} = \frac{35}{140} \Rightarrow x = \frac{35}{140} \times 4 \Rightarrow x = 1 b . \frac{5}{12} + \frac{5}{x} - \frac{1}{8} = \frac{1}{2} \Rightarrow \frac{5}{x} = \frac{1}{2} - \frac{5}{12} + \frac{1}{8} \Rightarrow \frac{5}{x} = \frac{12}{24} - \frac{10}{24} + \frac{3}{24} \Rightarrow \frac{5}{x} = \frac{5}{24} \Rightarrow x = 24 c . x + \frac{1}{9} - \frac{3}{5} = \frac{3}{6} \Rightarrow x = \frac{3}{6} - \frac{1}{9} + \frac{3}{5} \Rightarrow x = \frac{45}{90} - \frac{10}{90} + \frac{54}{90} \Rightarrow x = \frac{89}{90} d . \frac{3}{4} - x + \frac{6}{- 11} = \frac{5}{6} \Rightarrow x = \frac{3}{4} + \frac{6}{- 11} - \frac{5}{6} \Rightarrow x = \frac{198}{264} - \frac{144}{264} - \frac{220}{264} \Rightarrow x = \frac{- 166}{264} = \frac{- 83}{132} e . x : \frac{13}{16} = \frac{5}{- 8} \Rightarrow x = \frac{5}{- 8} \times \frac{13}{16} \Rightarrow x = \frac{- 65}{128} f . x . \frac{- 14}{28} = \frac{6}{- 9} - \frac{2}{15} \Rightarrow x . \frac{- 14}{28} = \frac{- 4}{5} \Rightarrow x = \frac{- 4}{5} : \frac{- 14}{28} \Rightarrow x = \frac{- 4}{5} \times \frac{28}{- 14} \Rightarrow x = \frac{8}{5} g . \frac{- 12}{25} . (\frac{3}{4} - x + \frac{6}{- 11} - \frac{5}{6}) = 0 \Rightarrow \frac{3}{4} - x + \frac{6}{- 11} - \frac{5}{6} = 0 \Rightarrow x = \frac{3}{4} + \frac{6}{- 11} - \frac{5}{6} \Rightarrow x = \frac{- 83}{132} h . x : \frac{4}{28} = \frac{13}{- 19} + \frac{8}{25} = > x : \frac{4}{28} = \frac{- 173}{475} = > x = \frac{- 173}{475} \times \frac{4}{28} = > x = \frac{- 173}{3325}$

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Answer 2

Bài 1:

$f . \frac{- 5}{13} - (\frac{3}{5} + \frac{3}{13} - \frac{4}{10}) = \frac{- 5}{13} - \frac{3}{13} + \frac{4}{10} - \frac{3}{5} = \frac{- 8}{13} + \frac{4}{10} - \frac{6}{10} = \frac{- 8}{13} + \frac{- 2}{10} = \frac{- 8}{13} - \frac{1}{5} = \frac{- 53}{65} g . (\frac{1}{9} - \frac{9}{17}) + \frac{3}{6} - (\frac{12}{17} - \frac{1}{2}) + \frac{5}{9} = \frac{1}{9} + \frac{5}{9} - (\frac{9}{17} + \frac{12}{17}) + \frac{3}{6} + \frac{1}{2} = \frac{6}{9} - \frac{21}{17} + \frac{1}{2} + \frac{1}{2} = \frac{6}{9} - \frac{21}{17} + 1 = \frac{22}{51}$

Bài 2:

$a . \frac{x}{4} - \frac{3}{7} + \frac{2}{5} = \frac{31}{140} \Rightarrow \frac{x}{4} = \frac{31}{140} + \frac{3}{7} - \frac{2}{5} \Rightarrow \frac{x}{4} = \frac{31}{140} + \frac{60}{140} - \frac{56}{140} \Rightarrow \frac{x}{4} = \frac{35}{140} \Rightarrow x = \frac{35}{140} \times 4 \Rightarrow x = 1 b . \frac{5}{12} + \frac{5}{x} - \frac{1}{8} = \frac{1}{2} \Rightarrow \frac{5}{x} = \frac{1}{2} - \frac{5}{12} + \frac{1}{8} \Rightarrow \frac{5}{x} = \frac{12}{24} - \frac{10}{24} + \frac{3}{24} \Rightarrow \frac{5}{x} = \frac{5}{24} \Rightarrow x = 24 c . x + \frac{1}{9} - \frac{3}{5} = \frac{3}{6} \Rightarrow x = \frac{3}{6} - \frac{1}{9} + \frac{3}{5} \Rightarrow x = \frac{45}{90} - \frac{10}{90} + \frac{54}{90} \Rightarrow x = \frac{89}{90} d . \frac{3}{4} - x + \frac{6}{- 11} = \frac{5}{6} \Rightarrow x = \frac{3}{4} + \frac{6}{- 11} - \frac{5}{6} \Rightarrow x = \frac{198}{264} - \frac{144}{264} - \frac{220}{264} \Rightarrow x = \frac{- 166}{264} = \frac{- 83}{132} e . x : \frac{13}{16} = \frac{5}{- 8} \Rightarrow x = \frac{5}{- 8} \times \frac{13}{16} \Rightarrow x = \frac{- 65}{128} f . x . \frac{- 14}{28} = \frac{6}{- 9} - \frac{2}{15} \Rightarrow x . \frac{- 14}{28} = \frac{- 4}{5} \Rightarrow x = \frac{- 4}{5} : \frac{- 14}{28} \Rightarrow x = \frac{- 4}{5} \times \frac{28}{- 14} \Rightarrow x = \frac{8}{5} g . \frac{- 12}{25} . (\frac{3}{4} - x + \frac{6}{- 11} - \frac{5}{6}) = 0 \Rightarrow \frac{3}{4} - x + \frac{6}{- 11} - \frac{5}{6} = 0 \Rightarrow x = \frac{3}{4} + \frac{6}{- 11} - \frac{5}{6} \Rightarrow x = \frac{- 83}{132} h . x : \frac{4}{28} = \frac{13}{- 19} + \frac{8}{25} = > x : \frac{4}{28} = \frac{- 173}{475} = > x = \frac{- 173}{475} \times \frac{4}{28} = > x = \frac{- 173}{3325}$

Answer 3

Bài `1` :

` f) -5/13-(3/5+3/13-4/10) `

` =-5/13-3/5-3/13+4/10 `

` =(-5/13-3/13)+(-3/5+4/10) `

` =-8/13+(-1/5) `

` =-53/65 `

` g) (1/9-9/17)+3/6-(12/17-1/2)+5/9 `

` =1/9-9/17+3/6-12/17+1/2+5/9 `

` =(1/9+5/9)+(-9/17-12/17)+(3/6+1/2) `

` =2/3-21/17+1 `

` =-29/51+1 `

` =22/51 `

bài $2$:

`a) x/4 - 3/7 + 2/5 = 31/140`

`=> x /4 = 31/140 - 2/5 + 3/7`

`=> x/4 = 1/4`

`=> x = 1`

Vậy `x = 1`

`b) 5/12 + 5/x - 1/8 = 1/12`

`=> 5/x = 1/12 + 1/8 - 5/12`

`=> 5/x = -5/24`

`=> x = -24`

Vậy `x = -24`

`c) x + 1/9 - 3/5 = 3/6`

`=> x = 3/6 + 3/5 - 1/9`

`=> x = 89/90`

Vậy `x = 89/90`

`d) 3/4 - x + 6/-11 = 5/6`

`=> -x = 5/6 - 6/-11 - 3/4`

`=> -x = 83/132`

`=> x = -83/132`

Vậy `x = -83/132`

e)` x:13/16=5/-8 `

` => x = 5/-8 xx 13/16 `

` => x = -65/128 `

f)` x.-14/28 =6/-9-2/15 `

` => x xx (-14/28 ) = -4/5 `

` => x = ( -14/28 ) : -4/5 :`

` => x = 5/8 `

g)` -12/25.(3/4-x+6/-11-5/6)=0 `

` => 3/4-x+6/-11-5/6 = 0 : ( -12/25 ) = 0 `

` => x + (6/-11 ) - 5/6 = 0 + 3/4 = 3/4 `

` => x + (6/-11 ) = 3/4 + 5/6 `

` => x + (6/-11 ) = 19/12 `

` => x = 19/12 - ( 6/-11 ) `

` => x = 281/132 `

` h,x:4/28 =13/-19+8/25 `

` => x : 4/28 = -173/475 `

` => x = -173/475 xx 4/28 `

` => x = -173/3325 `

` color[red][@Nam] `