AN=b搜索结果第14页,早教吧

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在等差数列{an}中，设Sn为它的前n项和，若S15＞0，S16＜0，且点A（3，a3）与B（5，a5）都在斜率为-2的直线l上．（Ⅰ）求a1的取值范围；（Ⅱ）指出S1a1，S2a2，…，S15a15中哪个值最大，并说明理数学

A.less than B.more than C.more D.less 2.there is a _.It_,you can"t teach an old dog new tricA.less than B.more than C.more D.l 英语

ss2.there is a

The wrong you"ve done him is terrible,_____ you should make an apology to him,I think． A．to which B．for that C．to what D．for which 英语

1在三角形ABC中,a=4,B=45°,若解此三角形时有且仅有唯一解,则b的取值范围.2已知an是等差数列,a2=3,a5=9,an=3,在等差数列中,a1+a2+a3=9,a1.a2.a3=15,则an=4用分期付款的方式,购买一件家电,价格为11500元,购数学

天付款1500元,以后每月这

()easy question it is!括号选什么 A.What B.How C.What a D.What an 英语

Alice was so excited ___ she received an ticket from her friend to attend the concert.A.where B.that C.why D.when为什么选D? 英语

下列词语中加点的字，读音完全正确的一项是（）A.骸骨（hái）潜行（qiǎn）狩猎（shǒu）迸溅（bèng）B.贪婪（lǎn）倏忽（shū）篡夺（cùan）气氛（fēn）C.匀语文

酝酿（niàng）

professor also mentioned an artide ( )by Zhu ZiqingA.supposed to have been written B.supposed to be written C.supposing to have been w 英语

itten D.suppos

There is_____ cake on the table.It"s for you.A.a B.an C.the D./ 选什么?理由.cake什么时候可数，什么时候不可数英语

I am an _____,but I can speak Chinese well.A.English B.Englishman A和B都是英国人啊,选哪个呢? 英语

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