Definition

Examples

• 我们需要解这个方程。
  Wǒmen xūyào jiě zhège fāng chéng.
  We need to solve this equation.
• 老师在黑板上写了一个方程。
  Lǎoshī zài hēibǎn shàng xiě le yí gè fāng chéng.
  The teacher wrote an equation on the blackboard.
• 这个方程有两个未知数。
  Zhège fāng chéng yǒu liǎng gè wèizhīshù.
  This equation has two unknowns.