3.做一做:数列1,3,6,10,15,…的递推关系是( B )a1=1, A.an+1=an+n,n∈N.一a1=1, B.an=an-12a1=1, C.an++=an+(n+1),n∈N1,n≥2a1=1, D.an=an-1+(n-1),n∈N 相关知识点: 试题来源: 解析 答案见上将数列中的项代入验证即可求得. ...
(1)-64a3,16a2,12a; (2)-8an-1,-4an+1; (3)3x2y3,6x3y2z5,-12x2yz2 相关知识点: 试题来源: 解析 (1)∵系数的最大公约数是4,相同字母的最低指数次幂是a,∴公因式为4a; (2)∵系数的最大公约数是4,相同字母的最低指数次幂是an-1,∴公因式为-4an-1; (3)∵系数的最大公约...
商品名称:西门子3RT6024-1AN20 AC220V 50/60HZ 12A 1NO/1NC 商品编号:100071044713 货号:3RT60241AN20 类别:交流接触器 辅助触头:1NO+1NC 控制线圈类型:交流线圈 额定电流:2-100A 主触点数量-极数:3NO(3极) 线圈电压:AC220V 频率:50/60Hz
The aryne formed from 10 and amide ion in ammonia yields the corresponding 5,6,12,12a-tetrahydrodibenzo[b,g]indolizinium ion (13) by intramolecular capture, and 2-aminolaudanosine (11) by external addition of amide ion. Compound 13 is converted insitu to 5,6-dimethoxy-2-(4,5-dimethoxy...
(3aR,6S,10aS,12aR)-3a,6,10a,12a-tetramethyl-1-(6-methylheptan-2-yl)-2,3,5,5a,6,9,10,12-octahydro-1H-indeno[5,4-g][2]benzoxepin-8-one Basic information More.. Product Name: (3aR,6S,10aS,12aR)-3a,6,10a,12a-tetramethyl-1-(6-methylheptan-2-yl)-2,3,5,5a,6,9,10,12...
21.解下列递推关系:(1) \(u_1=5u_nu_n=5⋅h_1=10v_1=2+2n-3. 2)an=5.a=102) \(u_1=7u_n-12a_(n-2)+6n-5)=1,n≥2a_n=5,a_n=13. )2La=5,a=13(3)\(a_n=4a_n-5a_(n-2)+2a_n.+2⋅(n≥3)a_n=4,a_n=10_n=19. )an =4. a =10, a....
CAS No:4356-25-6 MF:C33H49N MW:459.74886 CID:1517987 PubChem ID:247301 Inquiry Supply Basic Information Names and Identifiers (1r,3as,3br,5as,12as,12bs,14ar)-12a,14a-dimethyl-1-[(2r)-6-methylheptan-2-yl]-1,2,3,3a,3b,4,5,5a,6,7,12,12a,12b,13,14,14a-hexadecahydrocyclopen...
别名希普瑞为;司美匹韦;(2R,3aR,10Z,11aS,12aR,14aR)-N-(环丙基磺酰基)-2,3,3a,4,5,6,7,8,9,11a,12,13,14,14a-十四氢-2-[[7-甲氧基-8-甲基-2-[4-(1-甲基乙基)-2-噻唑基]-4-喹啉基]氧基]-5-甲基-4,14-二氧代环戊并[c]环丙并[g][1,6]二氮杂环十四烯-12a(1H)-甲酰胺;...
∵单调递增数列{an}满足an+an+1+an+2=3n-6，且a2=12a1，∴a1+12a1+a3＝?3，解得a3＝?3?32a1，12a1?3?32a1+a4＝0，解得a4=a1+3，单调递增数列{an}中，a3＞a2，a4＞a3，∴?3?32a1＞12a1a1+3＞?3?32a1，解得?125＜a1＜?32．∴a1的取值范围是（-125，-32）．故答案为：（...
2、已知两个整数a、b,满足0小于b小于a小于10,且9a\a+b是整数,那么数对(a,b)有几个?3、已知实数x、y满足2x²-4xy+4y²-6x+9=0,则根号18xy的平方根是多少?4、已知(x-10)(x-a)+1是一个完全平方式,则a的值是5、三角形abc的三边长a、b、c满足b+c+8,bc=a²-12a+52,则三角形abc的周长...