在5,7,30,48,13,65,102,147,345这些数中是质数

音阶排列是固定的,哪个调的哪个音在几弦几品是不变的．3(Mi)在第二品,4(Fa)就在第三品;7(Xi)是空弦音,1(Do)就在该弦的第一品,这是因为3和4之间,以及7和1之间是半音．其它各音之间要隔

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9无论加还是减8都为奇数加或减7为偶数偶数加减偶数6为偶数偶数加减奇数5为奇数奇数加减偶数4为奇数奇数加减奇数3为偶数偶数加减偶数2为偶数偶数加减奇数1为奇数因为20不是奇数所以无解

3/2=1+1/25/6=1/2+1/37/12=1/3+1/49/20=1/4+1/511/30=1/5+1/613/42=1/6+1/715/5=1/7+1/8所以答案是3/2－5/6＋7/12－

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3/2-5/6+7/12-9/20+11/30-13/42+15/56=1又1/8http://zhidao.baidu.com/question/59401597.html?si=3

3/2-5/6+7/12-9/20+11/30-13/42+15/56=9/8思路如下：3/2＝（1+2）/（1*2）＝1+1/25/6＝（2+3）/（2*3）＝1/2+1/37/12＝（3+4）/（

第n个数是：1+2×(n−1)3+3(n−1)=2n−13n；n=100，2×100−13×100=199300；答：第100个数是199300．故答案为：199300．

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依题,f（4）＞0,f（5）＜0,f（6）＜0,f（7）＞0,f（4）=16-44+30+m＞0.m＞-2f（5）=25-55+30+m＜0,m＜0f（6）=36-66+30+m＜0.m＜0f（7）=

2009是第1005个数1-44组共990个数所以2009在第45组

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