下列运算中正确的是{"A":"aa\u2212b\u2212bb\u2212a=1","B":"ma\u2212nb=m\u2212na\u2212b","C":"a2a\u2212b\u2212b2a\u2212b=

题干

下列运算中正确的是（）

A： $\frac{a}{a - b} - \frac{b}{b - a} = 1$

B： $\frac{m}{a} - \frac{n}{b} = \frac{m - n}{a - b}$

C： $\frac{a^{2}}{a - b} - \frac{b^{2}}{a - b} = a + b$

D： $\frac{b}{a} - \frac{b + 1}{a} = \frac{1}{a}$

上一题下一题 0.0难度选择题更新时间:2012-07-20 10:56:49

C

请根据所听到的内容，选择表格中的正确信息，用5—6句话进行复述。

(将复述内容写下来)。

⑴ How about studying abroad in recent years? (enjoyable/popular)
Advantages	⑵ What's the first advantage? (make more friends／experience foreign life)
	⑶ What's the second advantage? (improve their foreign languages／learn about different cultures)
Disadvantages	⑷ What's the first disadvantage? (too young to look after themselves／too young to learn)
	⑸ What's the second disadvantage?(the low cost／the high cost)

你可以这样开始：The speaker is talking about…

Answer：____