1.Jill and Katy _________________________with their class to

1.Jill and Katy _________________________with their class tomrrow
Aare going to swimming Bare going swimming C go to swimming Dgo swimming
2.They promised————————————the work in three days
Ato finishB finishingCfinishesDfinished
3.若b+c分之一=1.c+a分之一=1,求b分之ab+1
mfx9458 1年前 已收到5个回答 举报
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se1661 幼苗

共回答了20个问题采纳率：80% 举报

A be going to do sth. 将来做某事 A promise to do sht. 承诺做某事1由b+1/c=1得：b=1-1/c=(c-1)/c,则1/b=c/(c-1),
由c+1/a=1得：1/a=1-c,则a=1/(1-c),
因此
b/(ab+1)

=a+1/b
=1/(1-c)+c/(c-1)
=1/(1-c)-c/(1-c)
=(1-c)/(1-c)
=1

1年前

4

过儿-7 幼苗

共回答了223个问题 举报

D go swimming
Ato finish
由b+1/c=1，得：b=1-1/c=(c-1)/c，则1/b=c/(c-1)，
由c+1/a=1，得：1/a=1-c，则a=1/(1-c)，
所以
b分之ab+1
=a+1/b
=1/(1-c)+c/(c-1)
=1/(1-c)-c/(1-c)
=(1-c)/(1-c)
=1

1年前

2

7702220 幼苗

共回答了3个问题 举报

  1. A are going to swimming （ be going to 结构 ）

  2. A to finish &...

1年前

2

fuxiaoling 幼苗

共回答了8个问题 举报

  1. D; 2. A;

3. bc+1=c, ac+1=a. c=1/(1-b) then a/(1-b)+1=a, that is a+1-b=a-ab. then ab+1=b. (ab+1)/b=1

1年前

0

babyblue009 幼苗

共回答了50个问题 举报

  1. A 2.A 3.是b+（1/c）=1， c+（1/a）=1求（ab+1)/b 吗？

1年前

0
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