Question

[Nguyễn Thị Khánh Huyền]

Thực Hiện Phép Tính

a)\(\left(\dfrac{9}{25}-2.18\right)\) : \(\left(\dfrac{19}{5}+0,2\right)\) =

b) \(1\dfrac{4}{23}\) + \(\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\) =

mí bn giúp mink giải 2 phép tính này đi >.<

Answer 1

[Hắc Hường]

Giải:

a) \(\left(\dfrac{9}{25}-2.18\right):\left(\dfrac{19}{5}+0,2\right)\)

\(=\left(-\dfrac{891}{25}\right):4\)

\(=-\dfrac{891}{100}\)

Vậy ...

b) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)

\(=1+\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)

\(=\left(1+0,5\right)+\left(\dfrac{4}{23}-\dfrac{4}{23}\right)+\left(\dfrac{5}{21}+\dfrac{16}{21}\right)\)

\(=1,5+0+1\)

\(=2,5\)

Vậy ...