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17.2.1 分式的乘除

17.2.1 分式的乘除. 分数的乘除法法则 :. 分式的乘除法法则 :. 1 . 两个 相乘 ,把分子相乘的积作为积的分子, 把分母相乘的积作为积的分母; 2 .两个 相除 ,把  的分子分母颠倒位置后, 再与   相乘.. 分数. 分式. 分数. 分式. 除式. 除数. 被除式. 被除数.  即:. 例 1. 计算 :. 注意. 整式与分式运算时,可以把整式看成分母是 1 的分式.. 练一练:. 下面的计算对吗?如果不对,应怎样改正?. ×. 对. ×. ×. 探究活动:. 根据乘法的意义和分式的乘法法则填空:.

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17.2.1 分式的乘除

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  1. 17.2.1 分式的乘除

  2. 分数的乘除法法则: 分式的乘除法法则: 1.两个相乘,把分子相乘的积作为积的分子, 把分母相乘的积作为积的分母; 2.两个相除,把  的分子分母颠倒位置后, 再与   相乘. 分数 分式 分数 分式 除式 除数 被除式 被除数  即:

  3. 例1 计算: 注意 整式与分式运算时,可以把整式看成分母是1的分式.

  4. 练一练: 下面的计算对吗?如果不对,应怎样改正? × 对 × ×

  5. 探究活动: 根据乘法的意义和分式的乘法法则填空: (1)根据以上算式反映出来的规律,请你计算: (2)根据(1)题的结论,请你计算: ①         ②

  6. 再见!

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