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把40+12+18与15+30+49中两个数交换,可使两式子相等.①40与15 ②12与40 ③18与30那个答案是对的. 五年级下册第七单元数学试卷今年爷爷的年龄（小于100岁）是孙子的6倍,过了几年后,爷爷年龄是孙子的5倍,又过了几年,爷爷的年龄是孙子的4倍.那么爷爷今年是多少岁? 英语四级怎么考?有经验的朋友介绍下! 有英语四级考过六百分的吗?希望介绍一下经验 英语成绩太差 马上又要考四级了 有方法经验传授的嘛 There have been many changes in this place.这句中为什么用have?主语是什么?用have的决定因素是什么 There have been many change in Beijing.(同义句）Many changes ____ ____ ____in Beijing.急 there have been many changes in ______（recently）years请解析 为什么要用形容词 There have been many changes in this city in r___ yearsMr black finds it s____that his daughter doesn't want to travelDon't be a___.We will stay with youWater World attracts many v___ every yearI didn't mean it.I was just___(kid)Jim's parents were ve the,with,I,long,like,woman,hair,blonde 连词成句 2x+3×09=24.7怎么解 24-2x=3怎么解 3分之2X-3分之1X=24分之7怎么解 语文书上五年级园地6漫画父与子作文怎么写?开头，结尾最好好一点 根号(1-2sin40°cos40°)/ (cos40°-根号1-sin^2 50°) 全部根号1-2sin40°cos40° ( ) the women with long hair your mother（）the baby?怎么填什么?A:What's that over there?B:___?A:On the bed B:It's a skirt.A:__skirt is it__?Is it__,Wei Hua?B:No,it's not__.I think__Meimei's.A:Is it new or old?B:It's new.A:___ ___is it B:It's 化简：根号下1-2sin40°*cos40°/cos40°- 根号下1-sin^2 50° ( )man is your father?The one ( )black.A whoes;with B whose ;in C which ;in 6.— What ______ your cousin ______?— She is a bit thin with long black hair.6.— What ______ your cousin ______?— She is a bit thin with long black hair.A.is,look like B.does,like C.is,like D.does,be like7.Class begins.Stop _____ and ______ to 五年级下册语文书园地1作文怎么写 我的英语四级听力答对20题（连填空句子）,快速阅读8题,填词2,仔细阅读2,完形对8个,句子部分正确.请那离及格的边缘远吗？ 数学上是怎样定义"任意"这个词的? 化简根号1-2sin40°cos40°/cos40°-根号1-2sina^2 The man with long hair is Newton.对划线部分提问 划线部分是 with long hair She is a pretty lady __________ long hair A.at B.for C.with D.of countries和country的区别 有一道题there are many 《counties》in the world为什么要填书名号里的那个词? How many countries are there in the 英语完形填空There are many festivals in the Western countries. 关于2009年12月四级成绩的查询同仁们,2009年12月英语四级的成绩什么时候才能查询啊? 2009年12月四级成绩几号可以查询?在哪查? 语文四年级下册人教版30课我要这一课的分段、段落大意、主要内容、懂的和不懂的!时间一天,最好现在就有!