Nhanh hộ mk vs ạ.... Mk cho 5 sao

congtru17

2 năm trước

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bacrikuzoo

27 ) `-2/5` . `5/8` + `5/8` . `3/5`

= `5/8` . ( `-2/5` + `3/5`)

= `5/8` . `1/5`

= `1/8`

28) `1/4` . ( 10,3 - 9,8) - `3/4`

= `1/4` . `0,5` - `3/4`

= `1/4` . `1/2` - `3/4`

= `1/8` - `3/4`

= `1/8` - `6/8`

= `-5/8`

29) ( 3 - 2`3/5`) . 4`1/6` - 1`3/5` : 1`1/15`

= ( 3 - `13/5` ) . `25/6` - `8/5` : `16/15`

= `2/5` . `25/6` - `8/5` : `16/15`

= `5/3` - `3/2`

= `1/6`

30)

`3/7` . ( -0,5+1`1/2`) - `2/7` : 25%

= `3/7` . ( `-1/2` + `3/2`) - `2/7` : `1/4`

= `3/7` . `1` - `2/7` . `4/1`

= `3/7` - `8/7`

= `-5/7`

31)

`6/13` . `5/18` + `-7/24` + `5/8` . `7/13` + `-5/24`

= `5/18` . ( `6/13` + `7/13`) + (`-7/24` + `-5/24`)

= `5/18` . `1` + `-1/2`

= `5/18` + `-1/2`

= `2/9`

32) 75%- 1`1/2` + `0,5`. `12/5`

= `3/4` - `3/2` + `1/2` . `12/5`

= `3/4` - `3/2` + `6/5`

= `-3/4` + `6/5`

= `9/20`

33) `5/13` + `-5/7` + `-20/41` + `8/13` + `-21/41`

= ( `5/13` + `8/13` ) + ( `-20/41` + `-21/41`) + `-5/7`

= `1` + (-1) + `-5/7`

= 0 + `-5/7`

= `-5/7`

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daothanhduy2008

$\rm 27) \\ \dfrac{-2}{5}.\dfrac{5}{8}+\dfrac{5}{8}.\dfrac{3}{5}\\=\dfrac{5}{8}.(\dfrac{-2}{5}+\dfrac{3}{5})\\=\dfrac{5}{8}.\dfrac{1}{5}\\=\dfrac{1}{8}\\28)\\\dfrac{1}{4}:(10,3-9,8)-\dfrac{3}{4}\\=\dfrac{1}{4}:\dfrac{1}{2}-\dfrac{3}{4}\\=\dfrac{1}{2}-\dfrac{3}{4}=-\dfrac{1}{4}\\29)\\(3-2\dfrac{3}{5}).4\dfrac{1}{6}-1\dfrac{3}{5}:1\dfrac{1}{15}\\=\dfrac{2}{5}.\dfrac{25}{6}-\dfrac{8}{5}:\dfrac{16}{15}\\=\dfrac{5}{3}-\dfrac{3}{2}=\dfrac{1}{6}\\30)\\\dfrac{3}{7}.(-0,5+1\dfrac{1}{2})-\dfrac{2}{7}:25\%\ \\= \dfrac{3}{7}.1-\dfrac{2}{7}:\dfrac{1}{4}\\=\dfrac{3}{7}-\dfrac{8}{7}=-\dfrac{5}{7}\\31)\\\dfrac{6}{13}.\dfrac{5}{18}+\dfrac{-7}{24}+\dfrac{5}{18}.\dfrac{7}{13}+\dfrac{-5}{24}\\=\dfrac{5}{18}.(\dfrac{6}{13}+\dfrac{7}{13})+(\dfrac{-7}{24}+\dfrac{-5}{24})\\=\dfrac{5}{18}-\dfrac{1}{2}=-\dfrac{2}{9}\\32)\\ 75\%\ -1 \dfrac{1}{2}+0,5.\dfrac{12}{5}\\=\dfrac{3}{4}-\dfrac{3}{2}+\dfrac{6}{5}\\=-\dfrac{3}{4}+\dfrac{6}{5}\\=\dfrac{9}{20}\\33)\\ \dfrac{5}{13}+\dfrac{-5}{7}+\dfrac{-20}{41}+\dfrac{8}{13}+\dfrac{-21}{41}\\=(\dfrac{5}{13}+\dfrac{8}{13})+(\dfrac{-20}{41}+\dfrac{-21}{41})+\dfrac{-5}{7}\\=1+(-1)-\dfrac{5}{7}\\=-\dfrac{5}{7} \\\rm $

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