连词组句。

1. you, us, join, will 

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2. far, it, from, is, here,

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3. please, back, me, ask, call, her, to,

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4. how, have, been, this, like, long, you,

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5. this, cheap, notebook, but, is, of, nice, kind,

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脱式计算．（能简算的要简算）

15-8.13-1.87

5.14+3.225-6.302

3.95+5.36-1.95

13.67-（5.45+3.67）