quadratic

释义

• adj. [数] 二次的
• n. 二次方程式

词源

quadratic (adj.)

1650s, "square," with -ic + obsolete quadrate "a square; a group of four things" (late 14c.), from Latin quadratum, noun use of neuter adjective quadratus "square, squared," past participle of quadrare "to square, set in order, complete" (see quadrant). Quadratic equations (1660s) so called because they involve the square of x.

例句

• 1. Every function whose derivative is linear is a quadratic function. 任意一个导数为线性函数的函数都是二次函数.
• 2. This is usually a much stronger requirement than quadratic integrability. 这通常是一个比平方可积更强的要求.
• 3. The quadratic aperture of the cat's - eye diaphragm is imaged too large. 猫眼光栏的方形光孔成象太大.
• 4. Some quadratic equations have no real roots. 某些二次方程没有实数根.
• 5. Their difference is a quadratic residue of 17. 它们的差是17的平方剩余.