Tam giác \(HAB\) là tam giác:

\(\left( {2 + x} \right).{x^2}\)

\(2 + {x^2}\)

\(67{x^2}\)

\(2y + 1\)

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

\(x = \dfrac{1}{2}\)

\(x =  - 2\)

\(x = 2\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 2x\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 2x + 1\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 2x + 3\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 4{x^2} + 2x + 1\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 2x\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 2x + 1\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 2x + 3\)

\(f\left( x \right) - g\left( x \right) + h\left( x \right) = 4{x^2} + 2x + 1\)

\(OA = 2OD\)

\(OA = 3OD\)

\(3OA = 2OD\)

\(2OA = 3OD\)

\(OA = OB\)

\(OC\) là phân giác góc \(xOy\)

\(BC \,\bot \,{\rm{Ox}}\)

Cả A, B, C đều đúng