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,∠ADE＝∠B,∠DEC＝115°． 求∠C的度数 一个业务员赚取800元基本薪金和他销售1又1/2%的佣金.如果他赚取了942.50元在三月,有多少是他的总销售在这一个月? 当x→α时,求sinx-sinα/x-α的极限x→α而不是趋近于0为什么,能用limx→0.sinx/x＝1这个特殊极限?和差化积后要怎样弄，还有就是和差化积的公式是怎样的 [sin(sinx)]/x,x→0 的极限 英语翻译 六年级的英语第一课的意思是什么? 六年级上册英语第一课是? x^2-cosx^2(sinx)^2/x^2(sin)^2的极限怎么求啊?x趋向0, 六年级英语下册第一课第3页A的课文黑龙江教育出版社 三角形ABC中,角A,B,C所对的分别为a,b,c,已知cos2c=负9分之1,其中c为锐角,一.求sinc的值,...三角形ABC中,角A,B,C所对的分别为a,b,c,已知cos2c=负9分之1,其中c为锐角,一.求sinc的值,二.当a=2,2sinC=根号下5sinA 三角形ABC中,角A,B,C所对的分别为a,b,c,已知cos2c=负9分之1,其中c为锐角,一.求sinc的值,二.当a=2,...三角形ABC中,角A,B,C所对的分别为a,b,c,已知cos2c=负9分之1,其中c为锐角,一.求sinc的值,二.当a=2,2sinC=根 1+2+3+4+…+999+1000+999+…+4+3+2+1怎么算? 当x趋近于a,sinx - sina 比上 sin（x-a）的极限值希望有步骤说明,(sinx - sina)/sin(x-a) lim n→无穷(sinx-sina/sin(x-a)) a≠0 求极限 急打错了，应该是x→a 求lim(x趋于a)(sinx-sina)/sin(x-a) (a不等于0）的极限 几道初三英语语法题1.Mike doesn't work __________Tom.so hard as B.so hardly as 2.His birds _______fish for him every day.be caught B.are caught C.catch D.catches3.I like this silk dress.it_____so soft and smooth.is feeling B.has felt C.is fel l六年级英语第一课的单词怎吗读好的 初三英语语法试题（ ）Would you like to stay with us for _____National Day?A a b an c the d /请选出正确答案、并请做出详细说明为什么选择这个答案. 新标准小学六年级英语下册单词我要的是新标准的别给我弄个人教的 初三英语语法题,1.In 1980s,people in the countryside _ saw computers.A always B.never C.rarely D.sometimes2.The computer is only a machine.It cannot think.(join the two sentences with 'so')3.The camera made in 1999 costs ￥2800The camera made 初一下册英语第一课单词 想问几道关于初三英语语法的问题1.我知道since完成时的标志,那么当一个句子中出现since的时候,怎么判别这个句子是用现在完成时还是过去完成时? 一道初三英语语法题Do you know__________?A. when he has come B. why he didn't comeC. if he comes tomorrow D. whom is he looking forC为什么错?那B为什么可以用过去式？ 麻烦帮我算下英语4级分数我听力选择25个对了17个 填词8个对4个 句子3个对2个 快速阅读10个对7个 选词阅读10个 对4个 深度阅读10个对8个 完型填空20对12个 句子对了2个全对加2个半对作文发挥 麻烦帮我算一下英语四级分数听力选择对16个听力填词对5个,句子一个没对.快阅选择对5个快阅填空对2个15选10对5个仔细阅读对7个完型填空对12个翻译2或3个吧作文中等,写了200个字这样能过吗? 几道有关英语语法的题1.other,the others,another,others的区别及应用.2.以How,What开头的感叹句的区别.3.There_______a football game next week.A.is going to have B.is going to beC.will have D.will be have应该选什么,为什么, 关于英语语法的几道题1)The five-year-old boy often says what children____will sayA）twice his age B)twice as old as his age2)whether he succeeds or fails ________(not concern) me?第一题为何 不选B第二题考察主谓一致，谓语 几道英语语法题,1._____Annie's glass,I apologized to her.A.To break B.Breaking C.Having broken D.Break答案选了C2.The father was delighted to hear the child ___that.A.to say B.to have said C.say D.said 3.More and more trucks are seen ___betw 英语语法题几道把下列句子变成主从复合句1 He studied so hard as to catch up with all the other students.句中as 变成主从复合句?2 Things seen are mighter than things heard.3 United,we stand;devided,we fall.2 3句也变成主 麻烦大家帮我算一下09年6月大学英语四级成绩,快速阅读对了8个 听力短对话对了3个 长对话和短文理解8个 单词3个 句子每句写了几个单词 选词填空5个 仔细阅读7个 完型只对5个 翻译每个句子 09年6月英语四级卷面分估分56大家帮我算下最终出来的报道成绩可能是多少?其中听力17.快速阅读8分,选词填空1分,传统阅读16分,完形填空3.翻译2分,作文8分,听说四级最终还要加权等值处理才能 x-y=6,y-z=5,求x的平方+y的平方+z的平方-xy-yz-zx