思念故人的成语

平行四边形ABCD中,AE⊥BC于点E,AF⊥CD于点F,角EAF＝30°,AE＝4厘米,AF＝3厘米,求周长和面积 在一个一般的式子中（不是方程）这时得到分母为0,能不能说式子无解? 我想了十多年都无解三十六只缸,九只船来装,装单不装双,请问怎么装?这是我爸爸想了十多年的一道题,他是以前在书上看到这道智力题的 高中生物概念题(忘带书回来了QAQ) 忘带书了,会的说下!什么是热平衡? 用因式分解怎么解 因式分解怎么做 解 be pleased with还是at The water park is____________form here A an eleven kilometres walk B a eleven kilometre walkC a eleven kilometre walkD an eleven kilometre walkA B C D选哪一个B a eleven kilometres walk 英语翻译Eleven kilometers directly below the city one of the greatest earthquakes of 20th century had begun. 32.Under the bridge,however,almost directly below,__________ was a small canoe,with a boy in it.A.there B.where C.it D.which 已知(2^2n+1)+(4^n)=48,求n的值 2^(2n+1)+4^n=48,求n的值如题 已知4^n+1-2^2n=48,求n的值 在车站开始检票时,有名旅客在候车室等候进站.设旅客按固定速度增加,检票口检票的速度也是固定的.若开放一个检票口,则需30分钟猜可将排队等候检票的旅客全部检票完毕；若开放两个检票 某车站在检票前若干分钟就开始排队每分钟内来的旅客人数一样多.从开始检票到等候检票的队伍消失（还有人在接受检票）若同时开五个检票口则需30分钟,若同时开6个检票口,如果要是等候 be pleased with的意思be crowded withbe full of顺便回答下.只知道1个也说下.. the cumulative intake is below 100% of the ARfD 翻译 已知 1^2+2^2+3^2+...+n^2=n(n+1)(2n+1)/6,则1^2+3^2+...+（2n+1）^2=? Tina and her sister often go to the park同义句转换 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