a,2/3+3/4+7/2 b,2 1/3+2/3.(-4/3+1/6):5/6 c, 5/7.19/26+5/7.18/26-5/14.11/13 21/07/2021 Bởi Clara a,2/3+3/4+7/2 b,2 1/3+2/3.(-4/3+1/6):5/6 c, 5/7.19/26+5/7.18/26-5/14.11/13
a, $\dfrac{2}{3}$ + $\dfrac{3}{4}$ + $\dfrac{7}{2}$ = $\dfrac{2}{3}$ + ( $\dfrac{3}{4}$ + $\dfrac{7}{2}$ ) = $\dfrac{2}{3}$ + $\dfrac{17}{4}$ = $\dfrac{59}{12}$ b, $2$ . $\dfrac{1}{3}$( cái này bị sai đề bạn nha ) + $\dfrac{2}{3}$ . ( $\dfrac{-4}{3}$ + $\dfrac{1}{6}$ ) : $\dfrac{5}{6}$ = $\dfrac{2}{3}$ + $\dfrac{2}{3}$ . $\dfrac{-7}{6}$ : $\dfrac{5}{6}$ = $\dfrac{2}{3}$ + $\dfrac{2}{3}$ . ( $\dfrac{-7}{6}$ : $\dfrac{5}{6}$ ) = $\dfrac{2}{3}$ + $\dfrac{2}{3}$ . $\dfrac{-7}{5}$ = $\dfrac{2}{3}$ . ( $1$ + $\dfrac{-7}{5}$ ) = $\dfrac{2}{3}$ . $\dfrac{-2}{5}$ =$\dfrac{-4}{15}$ c, $\dfrac{5}{7}$ . $\dfrac{19}{26}$ + $\dfrac{5}{7}$ . $\dfrac{18}{26}$ – $\dfrac{5}{14}$ . $\dfrac{11}{13}$ = $\dfrac{5}{7}$ . ( $\dfrac{19}{26}$ + $\dfrac{18}{26}$ ) – $\dfrac{5}{14}$ . $\dfrac{11}{13}$ = $\dfrac{5}{7}$ . $\dfrac{27}{26}$ – $\dfrac{5}{14}$ . $\dfrac{11}{13}$ = $\dfrac{5}{7}$ . $\dfrac{27}{26}$ – $\dfrac{5}{7}$ . $\dfrac{1}{2}$ . $\dfrac{11}{13}$ = $\dfrac{5}{7}$ . ( $\dfrac{27}{26}$ – $\dfrac{1}{2}$ . $\dfrac{11}{13}$ ) = $\dfrac{5}{7}$ . ( $\dfrac{27}{26}$ – $\dfrac{11}{26}$ ) = $\dfrac{5}{7}$ . $\dfrac{8}{13}$ = $\dfrac{40}{91}$ # Try _ hard _ together Bình luận
`2/3 + 3/4 + 7/2` `= 8/12 + 9/12 + 42/12` `= (8 + 9 + 41)/12` `= 59/12` `2 1/3 + 2/3 . ((-4)/3 + 1/6) : 5/6` `= 7/3 + 2/3 . ((-8)/6 + 1/6) . 6/5` `= 7/3 + 2/3 . (-7)/6 . 6/5` `= 7/3 + (-14)/15` `= 7/5` `5/7 . 19/26 + 5/7 . 18/26 – 5/14 . 11/13` `= 5/7 . 19/26 + 5/7 . 18/26 – 5/7 . 1/2 . 11/13` `= 5/7 . (19/26 + 18/26 – 1/2 . 11/13)` `= 5/7 . 1` `= 5/7` Bình luận
a, $\dfrac{2}{3}$ + $\dfrac{3}{4}$ + $\dfrac{7}{2}$
= $\dfrac{2}{3}$ + ( $\dfrac{3}{4}$ + $\dfrac{7}{2}$ )
= $\dfrac{2}{3}$ + $\dfrac{17}{4}$
= $\dfrac{59}{12}$
b, $2$ . $\dfrac{1}{3}$( cái này bị sai đề bạn nha ) + $\dfrac{2}{3}$ . ( $\dfrac{-4}{3}$ + $\dfrac{1}{6}$ ) : $\dfrac{5}{6}$
= $\dfrac{2}{3}$ + $\dfrac{2}{3}$ . $\dfrac{-7}{6}$ : $\dfrac{5}{6}$
= $\dfrac{2}{3}$ + $\dfrac{2}{3}$ . ( $\dfrac{-7}{6}$ : $\dfrac{5}{6}$ ) = $\dfrac{2}{3}$ + $\dfrac{2}{3}$ . $\dfrac{-7}{5}$ = $\dfrac{2}{3}$ . ( $1$ + $\dfrac{-7}{5}$ )
= $\dfrac{2}{3}$ . $\dfrac{-2}{5}$ =$\dfrac{-4}{15}$
c, $\dfrac{5}{7}$ . $\dfrac{19}{26}$ + $\dfrac{5}{7}$ . $\dfrac{18}{26}$ – $\dfrac{5}{14}$ . $\dfrac{11}{13}$
= $\dfrac{5}{7}$ . ( $\dfrac{19}{26}$ + $\dfrac{18}{26}$ ) – $\dfrac{5}{14}$ . $\dfrac{11}{13}$
= $\dfrac{5}{7}$ . $\dfrac{27}{26}$ – $\dfrac{5}{14}$ . $\dfrac{11}{13}$
= $\dfrac{5}{7}$ . $\dfrac{27}{26}$ – $\dfrac{5}{7}$ . $\dfrac{1}{2}$ . $\dfrac{11}{13}$
= $\dfrac{5}{7}$ . ( $\dfrac{27}{26}$ – $\dfrac{1}{2}$ . $\dfrac{11}{13}$ ) = $\dfrac{5}{7}$ . ( $\dfrac{27}{26}$ – $\dfrac{11}{26}$ ) = $\dfrac{5}{7}$ . $\dfrac{8}{13}$ = $\dfrac{40}{91}$
# Try _ hard _ together
`2/3 + 3/4 + 7/2`
`= 8/12 + 9/12 + 42/12`
`= (8 + 9 + 41)/12`
`= 59/12`
`2 1/3 + 2/3 . ((-4)/3 + 1/6) : 5/6`
`= 7/3 + 2/3 . ((-8)/6 + 1/6) . 6/5`
`= 7/3 + 2/3 . (-7)/6 . 6/5`
`= 7/3 + (-14)/15`
`= 7/5`
`5/7 . 19/26 + 5/7 . 18/26 – 5/14 . 11/13`
`= 5/7 . 19/26 + 5/7 . 18/26 – 5/7 . 1/2 . 11/13`
`= 5/7 . (19/26 + 18/26 – 1/2 . 11/13)`
`= 5/7 . 1`
`= 5/7`