中国F40T外贸护卫舰

1+2+3+...+n=?和2+4+6+...+2n=?我是初中新生...所以劳烦大家了~能让我明白的我就追加否则相反! 根据首字母填空 tina often （w ) letters to her friendsjane wants to buy a conmputer ,but she can t (a )itliu dehua is a (s ） ACTOR .MANY PEOPLE LIKE HIM 1^2 + 2^2 + 3^2 + …… + n^2 = n(n+1)(2n+1)/6演绎推理过程 一个团队去旅游,如果订4人房间将会空出13个床位,如果订6人房间将会空出29个床位,问有多少人去旅游? tina swimming will make you ( )happy.let's go to swimfeel 还是feeling 为什么 1/n+1+1/n+2+……+1/2n1/(n+1)+1/(n+2)+……+1/2n 证明1-1/2+1/3-1/4+...+1/(2n-1)-1/2n=1/(n+1)+1/(n+2)+...1/2n 1-1/2+1/3-1/4+.+1/（2n-1)-1/2n=1/(n+1)+1/(n+2）+1/（3+n).+1/2n It's exciting to hang out with friends on sundays为什么用to hang Tina would like to eat out with her friends.对eatTina would like to eat out with her friends.对eat out提问 已知三角形的一个外角等于与它相邻的内角的2倍,且等于与它不相邻的一个内角的4倍,这是什么三角形 求y=2^(x+3)-3×4^x （-1≤x≤0）的值域 y=4^x－3.2^x+3,求x∈[1,2]时的值域 y=4^x－3.2^x+3,求当x∈[1,2]时的值域 求y=(x-1)(x-2)(x-3)(x-4)+15的值域 若：1+1/2^2+1/3^2+1/4^2+.+1/n^2=A 求 1/1^2+1/3^2+1/5^2+.+1/(2n-1)^2=? 已知x^n=5,y^m=3,求（a^2*y）^2n Be careful when you go ____ the street because the trafficis very busy at the moment.A.across B.behind C.between D.over her father will set out with her in a small boatin a small boat在句中是什么成份啊.还有什么其它的表达方式.这是翻译成她父亲和她一起乘小船出发呢,还是她父亲乘小船与她出发. 怎样看待谣言作文400字 以秋天为题,写三句话秋天像秋天像秋天像 走进秋天为主题写一段话 二次函数中,已知直角三角形两点在函数图上,怎么求第三点三点都在函数图像上 ring out怎么用?相当于什么词性?好像没见过ringing out ,rang out 之类的.是形容词词性吗?但是Ring out the bells again,like we did when spring began.这句话又怎么解释呢?有没过去式之类的用法？ ring we walked out of the building ten minutes()with a new ringA ago.B later.A 为什么不可以Can I speak to Susan pleaseI am sorry .susan ()lives here she has moved outA no longer.B not any longer 两个都是不再的意思为什么选A不选B Ring out the bells again 的译文 根据意思填上歇后语或古诗句 你看,一株株金灿灿的迎春花探出小脑袋 你看这一株株金灿灿的迎春花从栏杆内探出了小脑袋,这真 (填诗句) ’ 你看,一株株金灿灿的迎春花从栏杆内探出了“小脑袋”,“真正是—”啊!歇后语或诗句（在直线处）, 一株株金灿灿的迎春花,从栏杆内探出小脑袋,用一句古诗来赞叹可以是什么 布袋中装有塑料数字1、2、3各若干,每次任选6个数字相加,至少选多少次才能保证有两个相加的和相等?帮帮忙吧,六年级的“抽屉原理”~