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X平方+Y平方=2X+2Y怎么化简 根号a^2-4=根号a+2*根号a-2成立的条件是根号a^2-4=根号a+2乘根号a-2成立的条件是还有一道，3次根号下a^2-1=3次根号下a+1乘3次根号下a-1成立的条件是 It takes me half an hour to cook dinnereveryday l____halt an hour ____dinner every dayIt takes me half an hour to cook dinnereveryday l____half an hour ____dinner every day Don't count every hour in the day.Make every hour in your day count She has dinner with her fanmily every weekend She eat with her family every weekend "Don't count every hour in the day ,make every hour in the day count"如何翻译? 碘和高锰酸钾的溶解性 我男的,不懂~可我是男的耶~,好怪噢~ 不好意思,新新人类词语已经不来塞了.“萌爆了”啥意思啊?是形容啥的呢? 初二上册物理复习提纲 草酸钙加稀硫酸溶解后与高锰酸钾反应如题,其方程式是：2KMnO4+5H2C2O4+3H2SO4=2MnSO4+K2SO4+10CO2+8H2O但草酸钙和硫酸的方程式是：CaC2O4+H2SO4=H2C2O4+CaSO4为什么硫酸钙没了,还有,如果说高锰酸钾和用稀硫 Make a family t( ) for your family 用稀盐酸溶解草酸钙后用高锰酸钾后溶液会由无色变成浅紫色? 关于Make a poster for your favorite singer的英语作文只要40个英语单词就行了 英语作文：Make Up Your Mind!Do you think it is difficult to make up your mind?When you have trouble making an important decision,what would you do?请英文高手就这两个问题帮我写一小段简单的英文文章,不要太艰难的单字, 已知关于X的方程x^2+ax+a+3=0有一个正数根和一个负数跟,求a的取值范围. 请写清步骤,谢谢! 九年级物理上册复习提纲 一题填空三题选择选择什么 九年级上册物理复习提纲(详细一点) 第二题是选词填空,第三题是选择填空1 ~6 第（2）题,请在8点回答 请回答第1一2题? 做晚饭是make the dinner还是do the dinner?the可不可以不要?加the和不加the意思一不一样? 请回答第二题? do dinner和make dinner的区别 5. 已知方程（a＋3）x ＋1=ax有负数根,求a的取值范围. make dinner中的dinner可以当成“饭”讲吗dinner不是晚饭的意思吗?make dinner为什么是做饭 tell about a time you helped to make dinner翻译 1.2.3题快解决了 重谢 英语改同义句：they often make her happy when she feels sad.改同义句：they often make her happy when she feels sad.they often____her____when she feels sad. 1.She often reads English newspapers at home(用now改写句子）2.Children are playing in the garden(改为否定句）3.My mother is preparing for dinner.(变为一般疑问句）4.Are those people talking about that event now?（作肯定和否 设f(x)=(1+x)+(1+x)^2+...+(1+x)^n,f(x)中x^2的系数为Tn,则limTn/(n^3+5n^2)等于：A:1/3 B:1/6C:1 D:2