在複數集上，方程x2+2x+2=0的根是______.

在複數集上，方程x2+2x+2=0的根是______.

根據題意，：△=22-4×1×2=-4所以原方程的根為：x＝−2±−42×1＝−1±i ； ；（i是虛數組織）整理，得x1=-1+i，x2=-1-i故答案為：-1±i
尋找一個形容詞或短語（短句）..
如題.形容一個人在頭腦不清醒下做了無法挽救的事.事後覺得極為丟臉..而且很後悔做過的事.極之放不下..詞或短語或短句均可！
懊悔無及翻然悔悟後悔無及悔不當初悔之不及悔之無及悔讀南華悔過自新悔恨交加嗟悔無及今是昨非噬臍何及噬臍莫及噬臍無及悔不當初
一時糊塗
追悔莫及
悔恨交加
悔不當初
後悔不已
追悔莫及
悔恨交加
Merry Christmas！！（*^__^*）
後悔莫及
怎一個悔字了得？
英語動詞單複數問題
They sometimes go for long walks in the park.
they是第三人稱複數動詞go不用變，但那個walks為什麼要加s啊？walk不是動詞嗎？
They sometimes go for long walks in the park.
they是第三人稱複數動詞go不用變，但那個walks，walk不是動詞，是名詞.
我是從事英語的，不明可問.
walk在這是名詞go to walk=go to have a walk=go for a walk =go for walks意思是去散步
go for a walk散步
這裡的walk作名詞用。步行、散步、步
long walks很長一段路。表示複數。
這裡的walk是名詞哦，go for a walk
It's a long walk to the station.
去車站要走很長一段路。
求：名詞複數練習題
My family__________（be）early risers.
我需要一個詞或一個短語/短句形容一個人！
這個人總覺得自己洞曉一切，可以看透每一個人，覺得自己看穿了所有人的內心，其實他顯得那麼無知，沒有人可以被完全看透，他倒不是自以為是，這樣一種性格用一個詞/短語/短句來形容下，謝謝！
聰明地糊塗
英語動詞為什麼有複數
如：boast的複數為boasts
不是負數，是第三人稱單數.
這是英語現存不多的一種曲折變化.
當主語不是我、你、我們、你們、他們、兩者或兩者以上時，用第三人稱單數.
用法也不盡相同，有些直接加s，有些加es，還有各種其它的，這裡就不細說了.
舉例：
meet——meets；kiss——kisses；fly——flies
像are就是系動詞的複數，主語是複數，動詞相對於單數主語也會有變化，
they arefriend.theyare playing football.i am a student.
當主語為單數第三人稱時，謂語動詞加s
如she，he，your father
英語題（名詞複數）
yo-yo
paper
photo
sheep
1.yo-yos
2.papers
3.photos
4.sheep
p.s.當paper不再是指紙的時候，它就可以數了.
yoyoes
paper是不可數的吧
photos
sheep單複同型
英語翻譯
1.成語
like a duck to water_______________
poor as a church mouse________________
at sixes and sevens_______________
spend money like water________________
as timid as ahare_______________
2.習慣用語
He ate like a horse._____________________________
His word made my blood boil._____________________
He was sheding crocodile tears.__________________
You’ve gone too far.____________________________
I get butterllies in my stomach._________________
┬┴┬┌—●—┬—│—┼—┐●├—┤○
┴┬┴├┬┌—┼—│◎││○└┬┘●
—┼—││││││—┴—┴——┼——
●│○││┴—┼—│○●／│＼
like a duck to water輕而易舉poor as a church mouse一貧如洗at sixes ahd sevens亂七八糟spend money like water揮金如土as timid as a hare膽小如鼠he ate like a horse他吃得狼吞虎嚥.his word made my bl…
1、
如魚得水
一貧如洗
七上八下
揮金如土
膽小如鼠
2、
他狼吞虎嚥
他的話令我憤怒
他是假慈悲
你太過份了
我心裡緊張
1.成語
like a duck to water_______________如魚得水、輕而易舉
poor as a church mouse________________一貧如洗
at sixes and sevens_______________亂七八糟
spend money like water________________花錢如流水
as t…展開
1.成語
like a duck to water_______________如魚得水、輕而易舉
poor as a church mouse________________一貧如洗
at sixes and sevens_______________亂七八糟
spend money like water________________花錢如流水
as timid as ahare_______________膽小如鼠
2.習慣用語
He ate like a horse.______________狼吞虎嚥
His word made my blood boil._____________他的話讓我熱血沸騰
He was sheding crocodile tears.__他在假慈悲
You’ve gone too far._______________________你太過分了
I get butterllies in my stomach._________________我心裡七上八下收起
like a duck to water_______________如魚得水
poor as a church mouse________________一貧如洗
at sixes and sevens_______________亂七八糟
spend money like water________________揮金如土
as timid as ahare__…展開
like a duck to water_______________如魚得水
poor as a church mouse________________一貧如洗
at sixes and sevens_______________亂七八糟
spend money like water________________揮金如土
as timid as ahare_______________膽小如鼠
He ate like a horse.：狼吞虎嚥。
His word made my blood boil.：他的話使我熱血沸騰。
He was shedding crocodile tears：他在惺惺作態。
You 've gone too fat.：你太過分了。
I get butterflise in my stomach：我的胃都意亂情迷了。收起
1.成語
如魚得水
一貧如洗
亂七八糟
揮金如土
膽小如鼠
2.習慣用語
他狼吞虎嚥
他的話讓我熱血沸騰
他在惺惺作態
你太過分了
我感到焦慮不安（心神不寧）
1.
1.如魚得水
2.一貧如洗
3.亂七八糟
4.揮金如土
5.膽小如鼠
2，
1他狼吞虎嚥
2他的話令我憤怒
3他是假慈悲
4你太過份了
5我心裡緊張
like a duck to water像鴨子下水般；不猶豫地，不懼怕地，自然地
poor as a church mouse窮得跟教堂裏的耗子一樣，非常窮
at sixes and sevens亂七八糟，不和
spend money like water揮金如土
as timid as a hare膽小如鼠
He ate like a hors…展開
like a duck to water像鴨子下水般；不猶豫地，不懼怕地，自然地
poor as a church mouse窮得跟教堂裏的耗子一樣，非常窮
at sixes and sevens亂七八糟，不和
spend money like water揮金如土
as timid as a hare膽小如鼠
He ate like a horse他狼吞虎嚥的，吃相跟馬一樣
His word made my blood boil他的話令我熱血沸騰
He was sheding crocodile tears他在惺惺作態
You’ve gone too far你已經走得太遠了
i get butterllies in my stomach我心裡緊張，七上八下收起
like a duck to water輕而易舉
poor as a church mouse一貧如洗
at sixes ahd sevens亂七八糟
spend money like water揮金如土
as timid as a hare膽小如鼠
he ate like a horse他吃得狼吞虎嚥。
his word made m…展開
like a duck to water輕而易舉
poor as a church mouse一貧如洗
at sixes ahd sevens亂七八糟
spend money like water揮金如土
as timid as a hare膽小如鼠
he ate like a horse他吃得狼吞虎嚥。
his word made my blood boil他的話讓我非常生氣。
he was shedding crocodile tears他在惺惺作態。
you've gone too far你太過分了。
i get butterflies in my stomach我感到焦慮不安。收起
like a duck to water如魚得水
poor as a church mouse一貧如洗
at sixes ahd sevens亂七八糟
spend money like water揮金如土
as timid as a hare膽小如鼠
he ate like a horse他吃得狼吞虎嚥。
his word made m…展開
like a duck to water如魚得水
poor as a church mouse一貧如洗
at sixes ahd sevens亂七八糟
spend money like water揮金如土
as timid as a hare膽小如鼠
he ate like a horse他吃得狼吞虎嚥。
his word made my blood boil他的話讓我非常生氣。
he was shedding crocodile tears他在惺惺作態。
you've gone too far你太過分了。
i get butterflies in my stomach我感到焦慮不安。收起
英語單複數動詞使用題
There is還是are no pens？
動詞選哪個？
There are nopens.PETS是複數形式
名詞單複數練習
______parents cares about their child
答案是neither，為什麼any不行，還有什麼可填的嗎？
因為neither後加三單，單數形式.後面cares加s的.所以，選neither.
any後用複數形式