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书架上有上下两层书,上层比下层多30本,下层比上层少5分之2,书架上有书多少本? 当代3位最有名的数学家中国外国都可以, 灭火器怎么用啊!急!帮帮我 电脑上就能做的,急 please give _____ book A.she her B.his his C.me my D.they themplease give _____ book A.she her B.hiplease give _____ book A.she her B.his his C.me my D.they themplease give _____ book A.she her B.his his C.me my D.they them Please give the book to (i)（选择适当的形式填空) What I love so much about life is that it's a mystery and who knows what lies 为什么微积分的解∫[1,2](x^2-2x-3)/x第一步是（x^2-2x-3）/x = x - 2 - 3/x(1,2) (x^2-2x-3)/x dx=∫(1,2) (x^2-2x-3)/x dx ⑴=∫(1,2) x-2-3/x dx ⑵=x^2/2-2x-3lnx |(1,2)=(2-4-3ln2)-(1/2-2)=1/2-3ln2 第一步是怎么变成第二步的? 解不定积分1/x*(2x^4+2x^2+1)^1/2 流转税简单解释 1. Laura Ingalls Wilder wrote many books about her life in the wilderness. Unit 1 is a true story from one of her books. On the edge of the Big Woods of Wisconsin in 1872, she lived with her family in a little log house. It is miles from any neighbor 英语语法题 About 40percent of the population of the country __________on farms.A.live b .stays cAbout 40percent of the population of the country __________on farms.A.live b .stays c.lives d.is理由 despite much research,there _____still certain elements in the life cycle of the insectthat ____not fully understood. A is,is B is,are C,are,is Dare,are Please give she a pencil-case修改病句 二次积分和三次积分的几何意义一样吗?几何意义各是什么? But forms of address reveal many assumptions we make about members of our speech community We must address the root cause behind much of the instability in our markets这句话 关键是当中 怎么翻 root cause 英语翻译Our company forms part of a consortium of local businesses working for environmental change. 化二重积分f(x,y)为二次积分D是由y轴,y=1及y=x围成的区域.f(x,y)dxdy=dx从o到1的积分乘以f(x,y)dy0到lnx的积分（双重积分和积分符号打不出来,请见谅）其中乘号后面一个积分的范围为什么是0到lnx阿? 求二次积分 ∫∫(x^2+y^2)dσ的二次积分为 m是什么实数时,关于x的一元二次方程mx^2-(1-m)x+m=0没有实数根.已知函数f(x)=1/2x^2-3x-3/4,求使函数值大于0的取值范围 lives/the/forest/in/at 连词成句 若a小于0,则关于x的不等式组3x大于a 4x大于a的解集是? 问一道二次积分题 是二重积分 （1）若x,y>0,且1/x+9/y=1,求x+y的最小值（2）若x,y>0,且x+y=1,求4/x+1/y的最小值（3）求（x^2+13)/√（x^2+4)的最小值 求二次积分, 求二次积分的区域如图：怎样求二次积分区域, 1、已知:x^2+y^2=a,m^2+n^2=b(a,b>0),求mx+ny最大值.2、设a,b属于R+,求证：a/√b + b/√a ≥√a + √b. 《我爱我班》作文怎么写? 作文:对手.只有告诉我可以写什么就行了, 连词成句: cinema,It,the,0f,is,east,the