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17 tháng 8 2022

Đề sai rùi , bn ktra lại nhen 

17 tháng 8 2022

`2+3.(2.4)=0,4`

Đề là tìm `x` thì có thiếu đề ko v bn ?

11 tháng 4 2023

\(c,2\dfrac{1}{2}.\left(\dfrac{5}{2}-30\%\right)+2\\ =\dfrac{5}{2}.\left(\dfrac{5}{2}-\dfrac{3}{10}\right)+2\\ =\dfrac{5}{2}.\left(\dfrac{5.5-3}{10}\right)+2\\ =\dfrac{5}{2}.\dfrac{11}{5}+2\\ =\dfrac{11}{2}+2\\ =\dfrac{11+2.2}{2}\\ =\dfrac{15}{2}\)

\(d,3\dfrac{1}{2}-0,4.\left(50\%-\dfrac{3}{2}\right)+\dfrac{3}{4}\\ =\dfrac{7}{2}-\dfrac{2}{5}.\left(\dfrac{1}{2}-\dfrac{3}{2}\right)+\dfrac{3}{4}\\ =\dfrac{7}{2}-\dfrac{2}{5}.\left(\dfrac{-2}{2}\right)+\dfrac{3}{4}\\ =\dfrac{7}{2}-\dfrac{2}{5}.\left(-1\right)+\dfrac{3}{4}\\ =\dfrac{7}{2}+\dfrac{2}{5}+\dfrac{3}{4}\\ =\dfrac{70}{20}+\dfrac{8}{20}+\dfrac{15}{20}\\ =\dfrac{93}{20}\)

11 tháng 4 2023

qq

29 tháng 4 2023

\(-2\dfrac{3}{4}.\left(-0,4\right)+1\dfrac{2}{5}.2,75-\left(-1,2\right):\dfrac{4}{11}\)

\(=\dfrac{11}{4}.\dfrac{2}{5}+\dfrac{7}{5}.\dfrac{11}{4}+\dfrac{6}{5}.\dfrac{11}{4}\)

\(=\dfrac{11}{4}.\left(\dfrac{2}{5}+\dfrac{7}{5}+\dfrac{6}{5}\right)\)

\(=\dfrac{11}{4}.\dfrac{15}{5}\)

\(=\dfrac{11}{4}.3\)

\(=\dfrac{33}{4}\)

29 tháng 4 2023

\(-2\dfrac{3}{4}.\left(-0,4\right)+1\dfrac{3}{5}.2,75-1,2:\dfrac{4}{11}\)

\(=\dfrac{11}{4}.\dfrac{-2}{5}+\dfrac{8}{5}.\dfrac{11}{4}-\dfrac{6}{5}:\dfrac{4}{11}\)

\(=\dfrac{11}{4}.\dfrac{-2}{5}+\dfrac{8}{5}.\dfrac{11}{4}-\dfrac{6}{5}.\dfrac{11}{4}\)

\(=\dfrac{11}{4}\left(\dfrac{-2}{5}+\dfrac{8}{5}-\dfrac{6}{5}\right)\)

\(=\dfrac{11}{4}.0\)

\(=0\)

\(=\dfrac{11}{4}\cdot\dfrac{2}{5}-\dfrac{8}{5}\cdot\dfrac{11}{4}+\dfrac{-6}{5}\cdot\dfrac{11}{4}\)

=11/4x(-12/5)=-132/20=-33/5

18 tháng 8 2018

A=\(\frac{1}{2}+\frac{1}{3}+0,4+\frac{5}{7}+\frac{1}{6}-\frac{4}{35}\)

\(A=\frac{3}{6}+\frac{2}{6}+\frac{2}{5}+\frac{5}{7}+\frac{1}{6}-\frac{4}{35}\)

\(A=\left(\frac{3}{6}+\frac{2}{6}+\frac{1}{6}\right)+\left(\frac{2}{5}+\frac{5}{7}-\frac{4}{35}\right)\)

\(A=1+\left(\frac{14}{35}+\frac{25}{35}-\frac{4}{35}\right)\)

\(A=1+1\)

\(A=2\)