\(\dfrac{-91}{200}\)

\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0,2\right)=\left(\dfrac{9}{25}-36\right):\left(\dfrac{19}{5}+0,2\right)=-\dfrac{891}{25}:4=-\dfrac{891}{100}\)

`(9/25 - 2.18 ) : ( 3 4/5 + 0,2)`

`=(9/25 - 36):( 19/5 + 1/5)`

`=(9/25 - 900/25):4`

`=-891/25 : 4`

`=-891/25 . 1/4`

`=-891/100`

Ta có: \(\left(\dfrac{9}{25}-2\cdot18\right):\left(3+\dfrac{4}{5}+0.2\right)\)

\(=\left(\dfrac{9}{25}-36\right):4\)

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

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

mình ghi nhầm a = \(\frac{20}{3}\)

a = 20\(\frac{20}{3}\)

b = \(\frac{45}{4}\)

bạn ghi rõ câu c ra cho mình nhé

\(\left(\frac{9}{15}-2,18\right):\left(3\frac{4}{5}+0,2\right)=\left(0,6-2,18\right):\left(3,8+0,2\right)=-1,58:4=-0,395\)

= -8,91             

     \(x^2=16\)

<=>\(x=\sqrt{16}\)

<=>\(x=4\)

\(\left(\frac{9}{25}-2\cdot18\right):\left(3\frac{4}{5}+0,2\right)\)

\(< =>\left(\frac{9}{25}-36\right):\left(\frac{19}{5}+\frac{1}{5}\right)\)

\(< =>\frac{-891}{25}:4\)

\(< =>\frac{-891}{100}\)

\(x^2=16\)

\(< =>4^2=16\)

mk chuc ban hoc tot nhe :))

\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0,2\right)\)

=\(\left(\dfrac{9}{25}-36\right):4\)

= -35,64:4=-8,91

a) \(=-\frac{91}{50}:4\)

   \(=-\frac{91}{200}\)

b) \(=\frac{5}{18}-\frac{26}{5}+\frac{18}{5}\)

   \(=-\frac{119}{90}\)

\(\left(\frac{9}{25}-2,18\right):\left(3\frac{4}{5}+0,2\right)\)

\(=\left(-1,82\right):4\)

\(=-0,455\)

tự tính đc mà (╬▔皿▔)╯