Question

Tìm x, biết

(2/3-x)^2=1:4/9

Answer 1

(2/3 - x)² = 1 : 4/9

(2/3 - x)² = 9/4

(2/3 - x)² = (3/2)² hoặc (2/3 - x)² = (-3/2)²

2/3 - x = 3/2 hoặc 2/3 - x ,= -3/2

*) 2/3 - x = 3/2

x = 2/3 - 3/2

x = -5/6

*) 2/3 - x = -3/2

x = 2/3 - (-3/2)

x = 13/6

Vậy x = -5/6; x = 13/6

Answer 2

\(\left(\dfrac{2}{3}-x\right)^2=1:\dfrac{4}{9}< =>\left(\dfrac{2}{3}-x\right)^2=\dfrac{9}{4}< =>\left(\dfrac{2}{3}-x\right)^2=\left(\dfrac{3}{2}\right)^2< =>\dfrac{2}{3}-x=\dfrac{3}{2}< =>x=\dfrac{2}{3}-\dfrac{3}{2}=< =>x=-\dfrac{5}{6}\)