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  1. 二 次 根 式 复 习 水西中学 朱学明

  2. 表示一个非负数的算术平方根的式子如: (a≥0)叫做二次根式表示一个非负数的算术平方根的式子如: (a≥0)叫做二次根式 二次根式的概念:

  3. = = 二次根式的性质: ≥0 (a≥0) =a (a≥0) a (a >0) 0 (a = 0) -a (a<0)

  4. (a≥0 , b≥) (a≥0 , b≥) = (a≥0, b>0) 二次根式的乘除: = = (a≥0, b>0)

  5. 最简二次根式: 1、被开方数不含分数; 2、被开方数不含开的尽方的因数或因式; 3、分母中不含二次根式。

  6. 同类二次根式:   化为最简二次根式后被开方数相同。

  7. = = 二次根式的加减: 1、化简 2、合并 +

  8. 1.填空题 (1)在实数范围内x________时,   有意义,当x________时,   有意义. (2)2+3 的有理化因式是________ (3) ,  ,  中为同类根式的是________ (4)当a<0时,|a-1|+=________ (5)在实数范围内把  -5分解为________