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★现代数学符号是怎样演变来的?★譬如＋－×÷＝ ＞ ＜ 等等. 现代数学一共有多少个数学符号? 如果a小于0,b小于0,且/2a/大于/3b/,则3b-2a是一个（ ）A、负数 B、正数 C、0 D、以上情况都有可能 2a(a-b)-3b(2a-b)咋做化简！！！ ( )1.Can you tell me how long your father ____( )1.Can you tell me how long your father _______getting to his office A.pays B.takes C.spends D.costs can you tell me waht your father is like的同义句 Can you tell me where your father works.work为什么加s 远远地街灯明了,好像闪着无数的明星.天上的明星现了,好像闪着无数的街灯.仿写：牵牛花开放了…… 若a/b=3,求a+3b/2a-3b的值 2a=3b 求a:b的值快. ________(do,to do) some shopping in the city is very convenient 请问用pretend表示 没有假装怎么说,我老师说 not pretend和pretend not都表示假装没有 pretend和disguise的区别?请不要复制词典的内容!最好给出一些例子来, 设2a-3b=0(a≠b),则a／a-b=? they usually go to the shop and help their mother_____ the shopping. What is the hottest topic at your school?In Hangzhhou Yongjin Middle SchoolWhat is the hottest topic at your school?In Hangzhou Yongjin Middle School,it’s money.The school ran an activity called “Making a Living” recently.About 800 Junior One a 英语阅读翻译:what is the hottest topic at your school recently短文翻译成现代文 what's the hottest topic at your school recently?In Hangzhou Yongjin Middle School,it's moneythe school held an activity called "making money"last weekend About 200Junior 2 students were divided into 30 teams they went to make money by selling things 若（2a-3b）°=1成立,则a,b满足什么条件? 那个孩子假装要哭了 pretend to 翻译 Pretend that the strong怎么翻译? 英语翻译 what is happened in your neighbourhood 写一篇英语作文,150字数 花的拼音是什么 花的汉语拼音是什么 英语翻译But even here this is not the conscientious discretionary judgment of the judge (as Chancellor Ellesmere would have had it),but rather the situated,experience-informed judgment of thejudge using all the resources the vast body of the law What is your name?How old are you? -————? A how old are you? B how are you C what's your name it's seven D what's the time为什么不选A而选D呢it's seven 这是答句 秀 拼音怎么写 秀的拼音怎么写 下列句子中加括号字的意义或用法相同的一项是_____谢谢、、、A、（故）不为苟得也 两狼之并驱如（故）B、二者不可（得）兼 所识穷乏者（得）我与C、是亦不可以（已）乎 死而后（已）D then,after one visit just before christmas ,mrs.bixby was standing at the station in baltimore,