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汶川地震事件国家地震局是怎么解释的为什么这么大规模的地震,地震局却不提前预报呢?有人说是因为奥运会所以隐瞒震情,如果是这样的话就太可怕了, 谁有初中几何拼图?就是给个平面图形,然后给剪开或怎么滴 再拼成一个什么正方形平行四边形的,我觉得这题挺开发智商 一道几何拼图 急 任意四边行裁剪两次,使之拼成一个平行四边形．不知道怎么裁啊? a△b=4a-3b,已知：x△(5△2)=46,求x△. 已知四边形ABCD内接于圆O,且∠A:∠C=2:3,则∠BOD等于多少度? 谁能帮我改改这篇英语作文My experience of learning English My experience with learning english began in primary school ,when I took my first English class.in grade four. My teacher often ask us to go to the platform. And when she 在三角形ABC中,a=14,∠A=60度,b:c=8:5,求S三角形ABC 输送导线总阻值10欧,输送功率20kw.若输电线在1h因发热损耗电能1kWh,问:输出电压?用户得到电压? 三角形三边分别为a.5 b.√8 c.√5求高,求面积!如果能有海伦公式或其他公式具体解答方法更好 设a,b是一个钝角三角形的两个锐角,求证sina+sinb＜根号2,cosa+cosb＞1 设A、B是一个钝角三角形的两个锐角,试证明：sinA+sinB＜√2 cosA+cosB＞1百度怎么了？怎么没人啦 飞机和小鸟相向飞行,飞机的速度是200m/s,小鸟的速度是10m/s,以飞机为参照物,小鸟飞行的速度是多大? 飞机和小鸟,小鸟速度为4M/S,飞机速度为200M/S相对于飞机,小鸟速度为多少 能帮我改改这篇英语作文吗,what qualities must a person have to make big money?Although becoming a million or billion is not my final dream,I must acknowledge that I need to have sufficient money if I want to achieve my dream.As there are m 512那么大的地震,地震局一点都测不到吗? 为什么地震局无法检测出地震这几年每次地震都没有预报,地震局测不出来吗 如图,在四边形ABCD中,AB等于AD,CB等于CD,点P是对角线AC上的一点,PE垂直BC于E,PF垂直CD于F.求证：PE等于PF. 如图,四边形ABCD中,E,F分别是AB,CD的中点,P为对角线AC延长线上的任意一点,PF交于M,PE交BC于N如图,四边形ABCD中,E,F分别是AB,CD的中点,P为对角线AC延长线上的任意一点,PF交AD于M,PE交BC于N,EF交MN于K,求 计算1+2+2^2+2^3+2^4+……+2^62+2^63 用初二的知识 帮忙改改英语作文Talk about moviesMovies are important for many people in the world.But what kind of movie is the best?Now let’s talk about movies.And choose the best movie for you.I think the best movies are useful for people.First,comedies 请帮忙改改英语作文,If I were a birdIf I were a bird,I would fly in the sky freely.If I were a bird,I wouldn't be worried about my study,and I wouldn't take the examination,too.I think bird is a symbol of freedom,it can fly to everywhere.if I 四阶魔方最后对两个角块公式是什么, (-5a^2b^3c^2)^2÷(-ab^2C)^3 计算：（-2x²y）³+8（x²）²•（-x）²•（-y）³ 汶川地震我为什么没有感觉到? 仿写,芦花开的时候,遥遥望去,黄绿的芦苇上好像什么?仿写,芦花开的时候,遥遥望去,黄绿的芦苇上好像盖了一层厚厚的白雪 0＜x＜6,则6x-x²的最大值为（ ） 计算和化简：①3b^3分之20a^4*25a^2分之12b^2②(-2b^3分之a^2)^3除以4b^2分之3a^4 英语翻译 2010.11.21哪里地震 厦门地震2010.11.21 13个8如何用加减乘除算等于2010