Question

tìm x

a)|5/4x-7/2|-|5/8x+3/5|=0

b)|2x-5|=x+1

c)|3x-2|-1=x

d)|3/5x-7|-2x=1

e)|7-2x|+7=2x

làm câu nào cũng đc nha

Answer 1

b) \(\left|2x-5\right|\)= x+1

\(\Rightarrow\) 2x-5 = x+1

\(\Rightarrow\) 2x-x=1+5

\(\Rightarrow\) x = 6

c) \(\left|3x-2\right|\)-1= x

\(\Rightarrow\) 3x-2-1= x

\(\Rightarrow\)3x-x =2+1

\(\Rightarrow\)2x =3

\(\Rightarrow\) x =\(\dfrac{3}{2}\)=1,5

e) \(\left|7-2x\right|\)+7 = 2x

\(\Rightarrow\)7-2x+7 =2x

\(\Rightarrow\) -2x -2x = -7-7

\(\Rightarrow\) -4x = -14

\(\Rightarrow\) x=\(\dfrac{14}{4}\)=\(\dfrac{7}{2}\)