\(=\left[\dfrac{109}{6}-\left(\dfrac{3}{50}:\dfrac{15}{2}+\dfrac{11}{3}\cdot\dfrac{38}{100}\right)\right]:\left(19-\dfrac{8}{3}\cdot\dfrac{19}{4}\right)\)

\(=\left[\dfrac{109}{6}-\dfrac{1}{125}-\dfrac{209}{150}\right]:\left[19-\dfrac{38}{3}\right]\)

\(=\dfrac{6287}{375}:\dfrac{19}{3}\simeq2,647\)

Tính :

\(\left[18\dfrac{1}{6}-\left(0,06:7\dfrac{1}{2}+3\dfrac{2}{8}.0,38\right)\right]:\left(19-2\dfrac{2}{3}.4\dfrac{3}{4}\right)\)

\(=\left[\dfrac{109}{6}-\left(0,06:\dfrac{15}{2}+\dfrac{26}{8}.0,38\right)\right]:\left(19-\dfrac{8}{3}.\dfrac{19}{4}\right)\)

\(=\left[\dfrac{109}{6}-\left(\dfrac{1}{125}+\dfrac{247}{200}\right)\right]:\left(19-\dfrac{38}{3}\right)\)

\(=\left[\dfrac{109}{6}-\dfrac{1243}{1000}\right]:\left(\dfrac{19}{3}\right)\)

Đến đây thì tự tính ra và kết luận nhé !

Máy tính nha 

Bạn ghi cách giải lun đi

\(a,\left(\frac{1}{\sqrt{625}}+\frac{1}{5}+1\right):\left(\frac{1}{25}-\frac{1}{\sqrt{25}}-1\right)\)

\(=\left(\frac{1}{25}+\frac{1}{5}+1\right):\left(\frac{1}{25}-\frac{1}{5}-1\right)\)

\(=\frac{31}{25}:\left(-\frac{29}{25}\right)\)

\(=\frac{31}{25}.\frac{-25}{29}\)

\(=-\frac{31}{29}\)

\(b,\left[18\frac{1}{6}-\left(0,06:7\frac{1}{2}+3\frac{2}{5}.0,38\right)\right]:\left(19-2\frac{2}{3}.4\frac{3}{4}\right)\)

\(=\left[\frac{109}{6}-\left(\frac{3}{50}:\frac{15}{2}+\frac{17}{5}.\frac{19}{50}\right)\right]:\left(19-\frac{8}{3}.\frac{19}{4}\right)\)

\(=\left(\frac{109}{6}-\frac{13}{10}\right):\frac{19}{3}\)

\(=\frac{253}{15}.\frac{3}{19}\)

\(=\frac{253}{95}\)

Số to :v

`(10,38+12,58+14,68) - (0,38+0,68+2,58)`

`= 10,38+12,58+14,68- 0,38-0,68 - 2,58`

`= (10,38- 0,38) +(12,58- 2,58)+(14,68- 0,68)`

`= 10 + 10 + 14`

`=20+14`

`=34`

 (10,38 + 12,58 + 14,68) - (0,38 + 4,68 + 2,58) 

= 37.64 - 7.64

= 30

Câu 11lam sao vậy 

(10,38+12,58+14,8)-(0,38+4,48+2,58)

=10,38+12,58+14,8-0,38-4,48-2,58

=10,38-0,38+12,58-2,58+14,48-4,48

=10+10+10=30