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21 章:二次根式
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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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