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高一数学选择 1.从前180 个正偶数的和中减去前180 个正奇数的和,其差为（ ）A.0 B.90 C.180 D.3602.一个等差数列前 项和为 ,后 项和为 ,所有项和为 ,则这个数列的项数为（ ）A.13 B.12 C.11 D.10.一个等差数列前 3项 高一数学的概念还有一些选择 The cat is behind the door behind the door.就划线部分提问 a,behind,there,door,is,cat,the(?) 连词成句 Is there a cat ______(under,behind,in)the door? 高中数学函数题求解题过程.答案是D. 函数题.只问第五题,（只问第五题） I majored in Enlish when I was in school=__ __ __ Enlish when I was in school Can you imagine———so stupid when I was in primary school?A．my being B．me to be C．me to have been D．mine to be请问这一题为什么选A? 求When l was in primary school,l got into.完形填空的答案 已知关于X的二次三项式x^2+mx+n有一个因式(x+5),且m+n=17,试求m,n的值详细步骤,谢谢 Look There is a cat ( ) the door介词 若M是关于X的三次三项式,N是 关于X的五次三项式,则M+N是关于X的__次多项式,M-N是关于X的__次多项式 There is a cat ? the door,so you can't see it. 如果两个直角三角形的两条边对应相等,哪这两个直角三角形全等的依据是?A:AAS B:SAS C:HL D:SSS 两边对应相等的两个直角三角形全等对吗 斜边对应相等两个的直角三角形全等 有一个角是30度的直角三角形全等 When I was an eleven-year-old primary school boy,all of my teachers complained about my unreadable handwriting． So I started taking my laptop to school and using it instead of paper,books and 1 At first I thought I was in heaven． Writing essays h I often fiew kites in spring when I was in the primary schoolI____ _____ ______ kites when I was in the primary school 浓盐酸稀释到底是把酸倒入水中还是把水倒入酸中? 某城市出租车收费如下:3km以内（含3km）收费8元,超过3km的部分,每千米收费1.4元.1.写出应收车费y元与出租车行驶路程xkm之间的函数关系式（其中x大于等于3）2.若某人付车费15元,出租车行驶了 中国银行公告一年期定期储蓄的年利率为2．25％,国家规定储蓄利息应付个人所得税的税率为20％,设按一年期定期储蓄存入银行的本金为x元,到期支取时扣除个人秘得税后实得本息和为y元.（1 为什么直角三角形角边边也能证明全等如题 怎么用边边角证明直角三角形全等 直角三角形边边角能证全等吗 When i'm with you 这首歌的中文翻译是什么 请问be associated with和associate...with使用时的区别? associate with 和be associated with区别 be associated with /be related to/ be connected with区别 be tied with 和be associated with都有和…联系在一起的意思,那么它们之间有何区别? associated with 和correlate with的区别 证明两个直角三角形全等可不可以用边角边（直角和两条直角边）的方法