10% + (1)3/4 - 0,9 : 9/4
\(=\dfrac{1}{10}+\dfrac{7}{4}-\dfrac{9}{10}\times\dfrac{4}{9}\)
\(=\dfrac{1}{10}+\dfrac{7}{4}-\dfrac{2}{5}\)
\(=\dfrac{2}{20}+\dfrac{35}{20}-\dfrac{8}{20}\)
\(=\dfrac{2+35-8}{20}\)
\(=\dfrac{29}{20}\)
\(=\dfrac{1}{10}+\dfrac{7}{4}-\dfrac{9}{10}\times\dfrac{4}{9}=\dfrac{1}{10}+\dfrac{7}{4}-\dfrac{2}{5}=\dfrac{2}{20}+\dfrac{35}{20}-\dfrac{8}{20}=\dfrac{29}{20}\)
`= 1/10 + 7/4 - 9/10 : 9/4`
`= 1/10 + 7/4 - 9/10 xx 4/9`
`= 1/10 + 7/4 - 2/5`
`= (2 + 35 - 8)/20`
`= 5/4`.
`10% + (1)3/4 - 0,9 : 9/4`
=`1/10 + 7/4 - 9/10 xx 4/9`
=`37/20 -2/5 `
= `129/20`
