氢氧化钠溶液的配制

已知a是方程x^2+x-3=0的一个根,求a^3+4 a^2 f(x)=(x-1)(x-2)(x-3)(x-4).问方程f`(x)=0有几个实根,并指出它们所在区间. 有关有情的诗句 After the new equipment was introduced ,they produced _____machines this year before.A as twice maAfter the new equipment was introduced ,they produced _____machines this year before.A as twice many B as many twice C twice as many D twice many as我 After the new technique was introduced,the factory produced _____cars in 2002 as 2002 as the year before.A as many twice B as twice many C twice many as Dtwice as many 选择哪一个,为什么,中文意思呢? they （r______）after a ball in the playground按首字母填空 耀什么扬什么成语 第四个字是扬的成语 英语直接引语变间接引语 什么情况下只是去掉引号 英语中的直接引语：是指一整句话包括引号里的内容,还是指引号里面的内容!如：下面这个例子？Ε？she said, "I like it very much"是指这一整句包括she said.还是指引号内的句子“i like it？Ε？ very 16(3x-2)^=(2x-1)^^是平方 风卷云兮云盖月,郎有情兮妾无意.意思相近的来. 妾似胥山长在眼,郎如石佛本无心是什么意思 枉妾椟中有玉 恨郎眼内无珠 是什么意思 分析下句子结构 妾能加什么偏旁并组词 妾和挥换偏旁组词 He hopes he can improve his math soon 同义句 特征怎么造句 党的十七大为什么要把“经济增长方式”改为“经济发展方式” 郎这个字怎么组词呀? 十七大为什么提出转变经济发展方式 郎字组词 改写句子,使与其原句意思相近或相同,每空一词.1.Comrade Wu is so careless that he can't do the job well .Comrade Wu isn't ______ _____ to do the job well.2.It's eleven o 'clock .He will be back at twelve .He will be back ____ _____ _ 在改写的句子中填入适当的词,使其与原句意思相同或相近1\My classmates are all friendly to me.my classmates are all ( ) ( ) me.2\mike sometimes talks to others in class.mike sometimes ( ) ( )others in class.3\they talk at the mee 郎字可以组什么词 根据上句改写下句,使上下两个句子意义相同或相近,一空一词．1．It will take us at least two days to plant these trees.We will _____ at least two days _____ these trees. 百什么孝为先 是不是应该百孝为先?做为一个子女来说,我们是不是应该孝敬父母呢?是不是我们自己的事情要自己做呢?我想是应该的!你们说是不是呢? 为什么百以孝为先拜托了各位 谢谢 下列说法正确的是 A无理数的和一定是无理数 B无理数的积一定是无理数 C有理数乘无理数一定是无理数D 有理数的积一定是有理数快!先排除B的可能,还要写理由! 我国2000年至今,在经济方面取得的重大成就,据三个例子