二重积分X区域Y型区域

"巫婆'英文怎么说 形容做事不能善始善终意思的成语 成语善始善终的意思和解释,用善始善终造句及其故事典故 根据意思,写出带有"蛇"字的成语.1.形容做事不能善始善终. 形容恐惧害怕,特别小心谨慎的是什么词语 形容又惊慌,又恐惧,说出一个词语 女巫英语怎么说? 巫师用英语怎么说?巫女呢? 可恶的女巫用英语怎么说? 形容恐惧的词语 已知4x－5z＝y－x+6z＝x+y+z,xyz不等于0,求x:y:z 已知4x-5z=y-x+6z=x+y+z,xyz≠0,求x：y:：z 4x-5z＝y-x＋6z＝x＋y＋z xyz≠0 求x∶y∶z的值结果是.5：3：2请问过程怎么写 x+y+z=4x-5y=y-x+6z,xyz不等0,x:y:z=? 解方程(x+1)/(x+2)-(x+2)/(x+3)=1/9x+7)-1/(x+6)解方程(x+1)/(x+2)-(x+2)/(x+3)=1/(x+7)-1/(x+6) 形容担心害怕的词语 求形容害怕的词语（3个）! 根据英语解释写单词 几道英语根据词义解释写出单词 给首字母.used to give a total number or amount【a____】to give sb money for work,goods,services,etc.【p_____】the amount of money that you have to pay for sth【p___】the act or sound of laughing【 形容敌人惊恐万状的词语 形容一个地方很诡异恐怖惊悚的词语包括四字词、三字词、两字词 只要是描写恐怖的词都发出来 根据英语解释写单词1 friendly informal talk 2public celebrations 3call loudly 4 plant,expecially of the sort used for food写英语单词 介词短语在动词后表方位那可以举个例子吗? 请问什么是介词短语作后置定语如题 求动词+介词词组!比如说look after look up...请以首单词的动词分类给类似的尽量多的词组,如果满意的,定将所有的分数追加~ 形容做了坏事又很害怕的二字词语冷门的最好 形容心里很害怕的词语 求几个形容很害怕地走着的词语原句：某人在幽暗的街灯下揣着包xx的走着要体现他小心翼翼,又很害怕（鬼之类）的心理 根据英文解释写单词1.go at fast pace2.make something different3.twelve o'clock at night or the period around the middle of the night4.paper with pictures and greetings,especially on holidays or on birthdays5.say something loudly 根据英语解释写出单词1,O_ all right 2,a_sister of ones father or mother 3,u_brother of ones father or mothaer 4,s_ a place where we can buy many things 5,w_we know the time with it 6,p_ many people carry food to outdoors to eat 7,b_ the firs _________(very interested)English is a very popular book for English learners.填写一个单词 急!在线等! 根据所给的英语解释,写出单词1.person in his teens 2.that can be moved easily and quickly from place to place3.drink made from plants or fruits especially juice of grapes1.t______2.m______3.w______