qq三国商城装备魂:懂初中数学英语物理的请帮忙

数学:
1.表示函数关系的方法通常有___,___,___三种.
2.求证:81^7(意思是81的7次方)-27^9-9^13能被45整除.
英语:
1.根据短文内容及所给的首字母,填入适当的单词:
Once a great boxer(拳击手)，Tick Black,went to a restaurant f___(1)dinner.He took off his coat and l___(2)it at the door,but he was a___(3)that someone would take it a___(4).So he took a piece of p___(5)and wrote on it,"The great boxer,Tick Black,leaves his coat here. He will come back in a f___(6)minutes."Then he put the paper on his coat and w___(7) to have his dinner.W___(8) he came back after dinner,he f___(9) that his coat was not there.But another note was left there. It said,"A great runner takes away your coat , and he will n___(10) come back."
物理：
1.泥瓦工常用重垂线来检验墙是否___,重垂线的使用过程中主要是利用了__________的原理.
2.解答题:
小明想用一只3.8V的小灯泡做一盏玩具台灯,电源用小型录音机的电源,由于这个电源的输出电压为6V,于是他找到了物理老师,物理老师经过实验告诉小明,这只灯泡发光时电阻约为13Ω,同时又给了他一段每厘米1Ω的电阻丝,要他自己想出方法制造台灯,你知道该怎么做吗?

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