A：---------------- B：My bus trip was relaxing.2.A:---------------B:Yes.Xinghui Zoo was agreat place.3.A---------------B:B:Oh,it was fine on Saturday and rainy on Sunday.4.A:------------------B;I went to Paris on vacation.

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A：----------------B：Mybustripwasrelaxing.2.A:---------------B:Yes.XinghuiZoowasagreatplace.3.A------

A：---------------- B：My bus trip was relaxing.2.A:---------------B:Yes.Xinghui Zoo was agreat place.3.A---------------B:B:Oh,it was fine on Saturday and rainy on Sunday.4.A:------------------B;I went to Paris on vacation.
A：----------------
B：My bus trip was relaxing.
2.A:---------------
B:Yes.Xinghui Zoo was agreat place.
3.A---------------
B:B:Oh,it was fine on Saturday and rainy on Sunday.
4.A:------------------
B;I went to Paris on vacation.

A：---------------- B：My bus trip was relaxing.2.A:---------------B:Yes.Xinghui Zoo was agreat place.3.A---------------B:B:Oh,it was fine on Saturday and rainy on Sunday.4.A:------------------B;I went to Paris on vacation.
A：---How was your bus trip?-------------
B：My bus trip was relaxing.
2.A:-----Was Xinghui Zoo a great place?----------
B:Yes.Xinghui Zoo was agreat place.
3.A------How was the weekend?---------
B:B:Oh,it was fine on Saturday and rainy on Sunday.
4.A:----Where were you on vacation?--------------
B;I went to Paris on vacation.
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(a+b).(a-b) a/b-b/a a+b>a-b, a-b>a,a+b 计算a+b/b-a-b/b -2a(a+b)+b(a+b) 化简|a|+|-b|-|a-b|-|a+b| 化简 |b|-|a|+|a-b|+|a+b| [(a+b)(a-b)-(a-b) (a+b)(a-b)-a-b因式分解化简 |a-b|+|a+b|-|a-b| 因式分解 a(a+b)-b(a-b) a(a+b)-b(a-b) A*b/a>A ,那么a/b a+b |a+b| a>,b (a+b)(a-b)等不等于(a-b)(a+b)