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# 第十六章 分式 - PowerPoint PPT Presentation

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16.1.1从分数到分式

?

a

1.长方形的面积为10cm²，长为7cm。

V

2、把体积为200cm³的水倒入底面积为 33cm²

（观察分母）

A

B

A=0而 B≠0时，分式 的值为零。

1、分式 的分母有什么条件限制？

2、当 =0时分子和分母应满足什么条件？

(1) 当x为何值时，分式无意义?

(2) 当x为何值时，分式有意义?

∴ x = -2

∴当x = -2时分式:

(2)由（１）得 当x ≠-2时，分式有意义

(3) 当x为何值时，分式的值为零?

(4) 当x= - 3时，分式的值是多少?

（４）当x ＝ -３时，

∴ x = ±2

∴x ≠ -2

①分子=0 ②分母≠0 ③最后答案

• 分式的定义

• 分式有意义

• 分式的值为0

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