临海市安全教育平台

三角形ABC是锐角三角形角B等于2角A,则b/a的取值范围? 在锐角三角形ABC中,角C=2角B,则c/b的取值范围 什么叫做95.98和99啊 1998/1998又1999分之1998 99×99×99×98×97×96×95 4x^8-12x^6 因式分解 2x^3-4x-8因式分解 因式分解：-4x^3+12x^2y-9xy^2 角A-角C=25度,角B -角A=10度,角B等于多少? 在角ABC中,角A=50度,角C-角B=10度,则角B=多少度,角C=多少度 99-98+97-96+95.+1=? Let me show you the novel that I borrowed form the library _____was newly opend to us.A who B which C that D whom我知道在B C里选那选B是因为避免重复吗？ 因式分解 4X^2-12X+3=0 求角A+角B+角C+角D+角E+角F的度数 英语题（尽量说明理由）1the boy m____ to get the apples on the tree yesterday.2jack enjoys __(exercise) on the playground every moring. 1___with the size of the whole earth,the highest mountain does not seem high at all.Awhen compared Bcomparing2liquids r like soleds ——they have a definite volume Afor that Bin that3u maynot have played very well today,but at least u've got throug 简要说明理由The cars made in this factory are better than ______made in other factories.A.this B.these C.that D.those 初中数学a²/（a-1）-a-1 已知a√1-b²+b√1-a²=1 求证a²+b²=1 初中数学已知a²-b²=4,那么(a+b)²(a-b)²的值 初中数学：ax³－1=(2x-1)(bx²－cx＋1),求a和b的值没啥积分,望智者不介 在△ABC中,∠A=1/2∠B=1/3∠C,则此三角形是（ ）.A.锐角三角形 B.直角三角形 C.钝角三角形D.等腰三角形 在三角形ABC中,∠A—∠B=∠C,那么这个三角形是（） 1.锐角三角形 2.直角三角形 3.钝角三角形4.等腰三角形 （x平方+4x+3）（x平方+12x+35）+15因式分解 (X的平方加4X加3)(X的平方加12X加35)加15的因式分解 因式分解(x²+4x+3)（x²+12x+35)+15 如何因式分解:(x^2-4x)(x^2-4x-2)-15 (x的二次方+4x+3）（x的二次方+12x+35）+15因式分解 1.Mr.Li regarda Ningxia as his second ______ because he has been here for over twenty years.空格填的是family为什么不可以是home?2.It's________ train ride from here to that city.空格填的是8 hours'为什么不可以是a 8-hour?3.Good mo 如图,已知角B＝38°,角C＝55°,角DEC＝23°,求角F的度数.求详解 如图,已知∠B=40°,∠C=59°,∠DEC=47°,求∠F的度数 已知：如图,∠ADE＝∠B,∠DEC＝115°． 求∠C的度数．