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HELP!THANKS~四个数成递增等差数列,中间两数的和为2,首末两项的积为-8,求这4个数. You can't run across the road.改为祈使句 HELP!在数列{an}中,对于所有n属于正整数,a1a2a3…an=n^2,则a3+a5=? run/saw/across/we/the/road/the/boy(连词成句)(2) watch/enjoys/cartoons/julie(连词成句)（3）go/a/picnic/they/on/about/talked(4)me/mind/you/help/do(5)football/play/is/at/good/he(6)cry/hear/every/we/night/baby/your(7)their/finished/homework/the Tell the children ( )across the road when.(not run) (y-x)的三次×(x-y)的m次方+(x-y)的m+1次方 怎么算. 计算:(x-y)三次方的m次方计算(x-y)三次方的m次方*(x-y)m次方的5次方=_______(m为正整数） ____ ____ ____ stay in the room with the air-condiioner in summer.(夏天待在空调房里很凉爽） 比较德国和意大利统一过程中的相似点? air the room的意思还有一个是为什么i have not any eggs?可以改成i have not got many eggs?前者用any,后者用many. 单项选择It's quite near.Just go-----the road.A cross B across take care Jas什么意思 take.care.of. take care precious什么意思 美国一战前与德国的矛盾 求一道理论力学题求问角加速度怎么求 初三化学的全部反应类型的概念和举例.全一点,什么氧化、还原等等比较生僻的也要 take Help!数列题1,某城市1996年底人口为20万,住房面积大约为8平方米,计划到2000年底人均住房面积达到10平方米,如果该市人口平均增长率控制在1%,那么要实现上述计划,每年该是要平均新建住房面积 take up take是什么意思 想了解中国经济地理,最好是有地理图册,该读什么书? 语c群里弧回来和垫是什么意思求大神求大神. 数列{an],n属于N,满足a0=0,a1=2且对任意n属于N有啊a(n+2)=2a(n+1)-an+2,求数列{an}的通项公式2,Tn=1/3a1+1/4a2+……+1/(n+2)an,求Tn 已知数列{an}中,a0=a1=1,且根号ana（n-2）-根号a（n-1）a（n-2）=2a（n-1）求数列{an}的通项公式．画括号的n-1 n-2均为角标 数列{an}中,a0=0,a1=1,2a（n+1）=2an+a（n-1),求an的通项公式. Tate sounds interesting.I don't have a soccer ball.合并为一句 Do you want a friend whom you could tell everything to ,like your deepest feelings and thoughts...Do you want a friend whom you could tell everything to ,like your deepest feelings and thoughts?的翻议是什么? (seen)to entered the room ,he was asked to the policeman.为什么不是having been seen? 高中英语Mr. Write was seen ( )the palace museum. A.enter B.to enter C.entered Dto have entered,B or D? 有什么规律 制定全抗战路线的会议是A.八七会议B.遵义会议C.洛川会议D.瓦窑堡会议