Question

Tìm x biết \(2\left(\frac{3}{2}-x\right)-5\left(x-\frac{3}{10}\right)=\frac{7}{4}\)

 

Answer 1

\(2.\left(\frac{3}{2}-x\right)-5.\left(x-\frac{3}{10}\right)=\frac{7}{4}\)

\(\Rightarrow2.\frac{3}{2}-2x-5x+5.\frac{3}{10}=\frac{7}{4}\)
\(\Rightarrow\frac{3}{2}+3-7x=\frac{7}{4}\)

\(\Rightarrow\frac{9}{2}-\frac{7}{4}=7x\)

\(\Rightarrow\frac{11}{4}:7=x\Rightarrow x=\frac{11}{28}\)

Answer 2

=3-2x-5x+3/2=7/4

=>3-7x=7/4-3/2=1/4

=>7x=3-1/4=11/4

=>x=11/4:7=11/28

Answer 3

=> 2 . 3/2 -2.x - 5.x +5. 3/10 = 7/4

=> 3 -2.x -5.x +3/2 = 7/4

=> 3 -7.x = 1/4

=> 7.x = 11/4

=> x= 11/28