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29 tháng 4 2023

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

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

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

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

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

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

21 tháng 3 2017

=\(\frac{81}{20}=4,05\)

7 tháng 8 2017

\(x\)x 54,4 = 25,7-678,5

\(x\)x 54,4= -652,8

\(x\)= -652,8 : 54,4

\(x\)= -12.

Tick mk nha bn!!!!!!!!!!!

7 tháng 8 2017

hinh nhu la

X x54,4=678,5-25,7

X x 54,4=.......

X=......x54,4

luu y:...... la ket qua

mik giai the chac dung do vi mik hoc rui

neu thay dung thi tick cho mik nhahihi

29 tháng 4 2023

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

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

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

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

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

\(=0\)

25 tháng 3 2019

\(\frac{-1275}{100}-2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-27}{2}\)

\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-1275}{100}-\frac{-27}{2}\)

\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-51}{4}-\frac{-54}{4}\)

\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{3}{4}\)

\(\frac{-11}{4}.x+11=2,75:\frac{3}{4}\)

\(\frac{-11}{4}.x+11=\frac{11}{4}:\frac{3}{4}\)

\(\frac{-11}{4}.x+11=\frac{11}{4}.\frac{4}{3}\)

\(\frac{-11}{4}.x+11=\frac{11}{3}\)

\(\frac{-11}{4}.x=\frac{11}{3}-11\)

\(\frac{-11}{4}.x=\frac{11}{3}-\frac{33}{3}\)

\(\frac{-11}{4}.x=\frac{-22}{3}\)

\(x=\frac{-22}{3}:\frac{-11}{4}\)

\(x=\frac{-22}{3}.\frac{4}{-11}\)

\(x=\frac{8}{3}\)

Vậy \(x=\frac{8}{3}\)

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

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

9 tháng 4 2018

\(2\frac{2}{4}\cdot\left(-0,4\right)-1\frac{2}{3}\cdot2,75+1,2:\frac{4}{11}\)

\(=\frac{5}{2}\cdot\left(\frac{-2}{5}\right)-\frac{5}{3}\cdot\frac{11}{4}+\frac{6}{5}:\frac{4}{11}\)

\(=\left(-1\right)-\frac{55}{12}+\frac{33}{10}\)

\(=\frac{137}{-60}\)