Question

A=(3x-2)²+(x+1)² - 2( x+1)(3x-2) tại x = 3​/2

khó quá huhu

Answer 1

\(A=\left(3x-2\right)^2+\left(x+1\right)^2-2\left(x+1\right)\left(3x-2\right)\)

\(A=\left(3x-2-x-1\right)^2=\left(2x-3\right)^3\)

Thay \(x=\dfrac{3}{2}\), ta được :

\(\left(2.\dfrac{3}{2}-3\right)^2=0\)

Answer 2

A=\(\left(3.\dfrac{3}{2}-2\right)^2+\left(\dfrac{3}{2}+1\right)^2-2\left(\dfrac{3}{2}+1\right)\left(3.\dfrac{3}{2}-2\right)\)

A=\(\dfrac{25}{4}+\dfrac{25}{4}-5.\dfrac{5}{2}=\dfrac{50}{4}-\dfrac{25}{2}=0\)