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21 章:二次根式

21 章:二次根式. 21.3 二次根式的加减( 2 ). (1) 如果几个二次根式的被开方数相同,那么可以直接根据分配律进行加减运算; (2) 如果所给的二次根式不是最简二次根式,应该先化简,再考虑进行加减运算。. 几个二次根式化成 最简 二次根式后,如果 被开方数相同 ,这几个二次根式就叫做 同类二次根式. 加减步骤:. 1 :化简. 2 :合并同类二次根式. 例 4 计算:. 练习 1 :计算. 例 5 计算:. 练习:计算. ( 1 ). ( 2 ). 解:. ( 1 )原式. ( 2 )原式. 例 6 : 计算:. ( 1 ).

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21 章:二次根式

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  1. 21章:二次根式 21.3二次根式的加减(2)

  2. (1)如果几个二次根式的被开方数相同,那么可以直接根据分配律进行加减运算;(1)如果几个二次根式的被开方数相同,那么可以直接根据分配律进行加减运算; (2)如果所给的二次根式不是最简二次根式,应该先化简,再考虑进行加减运算。 几个二次根式化成最简二次根式后,如果被开方数相同,这几个二次根式就叫做同类二次根式.

  3. 加减步骤: 1:化简 2:合并同类二次根式

  4. 例4 计算:

  5. 练习1:计算

  6. 例5 计算:

  7. 练习:计算 (1) (2) 解: (1)原式 (2)原式

  8. 例6: 计算: (1) (2)

  9. 练习2:计算

  10. 做一做: 1.求当a= 时,代数式(a -1)2 - (a+ )(a-1)的值.

  11. 再见

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