Toán d=-[2/19-9/23+7/28]+[-15/38+14/23+1/4]-5/8 26/07/2021 By Jade d=-[2/19-9/23+7/28]+[-15/38+14/23+1/4]-5/8
Giải thích các bước giải: D=-($\frac{2}{19}$-$\frac{9}{23}$+$\frac{7}{28}$)+($\frac{-15}{38}$+$\frac{14}{23}$+$\frac{1}{4}$)- $\frac{5}{8}$ D=$\frac{-2}{19}$+$\frac{9}{23}$-$\frac{7}{28}$-$\frac{15}{38}$+$\frac{14}{23}$+ $\frac{1}{4}$-$\frac{5}{8}$ D=($\frac{-2}{19}$+$\frac{-15}{38}$)+($\frac{9}{23}$+$\frac{14}{23}$)+($\frac{-7}{28}$+$\frac{1}{4}$)-$\frac{5}{8}$ D=($\frac{-4}{38}$+$\frac{-19}{38}$)+$\frac{23}{23}$+ ($\frac{-7}{28}$+$\frac{7}{28}$)-$\frac{5}{8}$ D=$\frac{-19}{38}$+1+0-$\frac{5}{8}$ D= $\frac{-1}{2}$+1-$\frac{5}{8}$ D=$\frac{1}{2}$-$\frac{5}{8}$ D=$\frac{4}{8}$-$\frac{5}{8}$ D= $\frac{-1}{8}$ Trả lời
`D =-(2/19-9/23+7/28)+(-15/38+14/23+1/4)-5/8` `⇔D = -2/19 + 9/23 – 7/28 – 15/38 + 14/23 + 1/4 – 5/8` `⇔D = (-2/19 – 15/38) + (9/23 + 14/23) – (7/28 – 1/4) -5/8` `⇔D = (-4/38 – 15/38) + 23/23 – (7/28 – 7/28) – 5/8` `⇔D = {-19}/38 + 1 – 0 – 5/8` `⇔D = -1/2 + 1 – 5/8` `⇔D = 4/8-5/8` `⇔D = -1/8`. Trả lời
Giải thích các bước giải:
D=-($\frac{2}{19}$-$\frac{9}{23}$+$\frac{7}{28}$)+($\frac{-15}{38}$+$\frac{14}{23}$+$\frac{1}{4}$)- $\frac{5}{8}$
D=$\frac{-2}{19}$+$\frac{9}{23}$-$\frac{7}{28}$-$\frac{15}{38}$+$\frac{14}{23}$+ $\frac{1}{4}$-$\frac{5}{8}$
D=($\frac{-2}{19}$+$\frac{-15}{38}$)+($\frac{9}{23}$+$\frac{14}{23}$)+($\frac{-7}{28}$+$\frac{1}{4}$)-$\frac{5}{8}$
D=($\frac{-4}{38}$+$\frac{-19}{38}$)+$\frac{23}{23}$+ ($\frac{-7}{28}$+$\frac{7}{28}$)-$\frac{5}{8}$
D=$\frac{-19}{38}$+1+0-$\frac{5}{8}$
D= $\frac{-1}{2}$+1-$\frac{5}{8}$
D=$\frac{1}{2}$-$\frac{5}{8}$
D=$\frac{4}{8}$-$\frac{5}{8}$
D= $\frac{-1}{8}$
`D =-(2/19-9/23+7/28)+(-15/38+14/23+1/4)-5/8`
`⇔D = -2/19 + 9/23 – 7/28 – 15/38 + 14/23 + 1/4 – 5/8`
`⇔D = (-2/19 – 15/38) + (9/23 + 14/23) – (7/28 – 1/4) -5/8`
`⇔D = (-4/38 – 15/38) + 23/23 – (7/28 – 7/28) – 5/8`
`⇔D = {-19}/38 + 1 – 0 – 5/8`
`⇔D = -1/2 + 1 – 5/8`
`⇔D = 4/8-5/8`
`⇔D = -1/8`.