Question

1. tìm x

a.\(\left(0,5.x-\dfrac{3}{7}\right):\dfrac{1}{2}=1\dfrac{1}{7}\)

b. \(\left|2-3x\right|-5=-1\)

c. \(\left(\dfrac{1}{5}-\dfrac{3}{2}x\right)^2=\dfrac{9}{4}\)

Answer 1

MÌNH GHI KẾT QUẢ THÔI NHÉ

A,2

b,\(\dfrac{-2}{3}\)hoặc2

c,\(\dfrac{13}{15}\)hoặc\(\dfrac{17}{-15}\)

Answer 2

a,\(\left(0,5.x-\dfrac{3}{7}\right):\dfrac{1}{2}=1\dfrac{1}{7}\)

0,5.x-\(\dfrac{3}{7}\)=\(\dfrac{8}{7}.\dfrac{1}{2}\)

0,5.x =1

x =2

b,|2-3x|-5=-1

|2-3x| =4

⇒2-3x=4 hoặc -4

TH1:2-3x=4

3x=-2

x=\(\dfrac{-2}{3}\)

TH2:2-3x=-4

3x=6

x=2

c,\(\left(\dfrac{1}{5}-\dfrac{3}{2}x\right)^2=\dfrac{9}{4}\)

⇒\(\dfrac{1}{5}-\dfrac{3}{2}x=\dfrac{3}{2}hoặc\dfrac{-3}{2}\)

TH1:\(\dfrac{1}{5}-\dfrac{3}{2}x=\dfrac{3}{2}\)

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

\(\dfrac{3}{2}x=-\dfrac{13}{10}\)

\(x=\dfrac{-13}{15}\)

TH2:\(\dfrac{1}{5}-\dfrac{3}{2}x=\dfrac{-3}{2}\)

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

\(\dfrac{3}{2}x=\dfrac{17}{10}\)

\(x=\dfrac{17}{15}\)