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2x^2-3x-10 的解集和解法 2/1(2x-1)-3(3/2x+2/1)=2/x 怎么算 推荐一首诗,要有作者 朝代 内容 我只有20l哦······· 推荐一首课外古诗与理由 小学一年级所谓的算术抽十法是什么东西?怎么运用? 请大家给我推荐一首古诗带理由ji 理由少一点3.4句就行 帮我做一做这道两题用算术法. 只写9 10 11 12 13 9.10.11.12. 牡丹、莲花、兰花、月季、菊花、茉莉又称什么?（要雅称哦!） 根据每种花的特点写两个词语,或题写两句诗.牡丹、菊花、兰花、月季、杜鹃花、荷花、山茶花、桂花、水...根据每种花的特点写两个词语,或题写两句诗.牡丹、菊花、兰花、月季、杜鹃花、 推荐一首最喜欢的古诗,并说出理由 United states前要加the吗?呢为什么America前不加 改错：1.The United States is composed of fifty states,two of those are separated from the pthers by hand or water.2.Meeting my uncle after all these years was an unforgettable moment,I will always treasure. 9999*222+333*334（简算）要过程 简算：33.33×222.2+11.11×333.4help me! the united states 怎么读 the united states怎么读 英语翻译The United States is on the verge of losing its leading place in the world's technology.So says more than one study in recent years.One of the reasons for this decline is the parallel decline in the number of U.S.scientists and engineers. the United States of America音标 用“一面.一面."造句 设函数f(x)=ln(x+1)+ax,(a属于实数a不等于0）（1）讨论函数f(x)的单调性（2）若a=1,证明：x属于（0,5）时,f(x)《9x/(x+1）成立 sin2*cos3*tan4=? 完形填空 In the united states in the states 为什么是美国?不该是United States吗? in the United __________ in the United States,St.Louis has now become the 24th largest city.[A] Once the fourth biggest city [B] The fourth biggest city it was[C]Being the fourth biggest city [D]It was once the fourth biggest city为什么选A?并翻译整句 设函数F（X）=4X+3 G（X）=2X-1.求F【G（X）】,解方程G【F（X）】=0 已知,函数F(X)=2X-1,求F(X+1)的表达式 已知F(X-1)=4X+5,求F(X)的表达式 已知tanβ=-3,tan(α+β)=-1/3,则 (1)求tanα的值 (2)求sin2α的值 tanα＝2,1/sin2α＝ 已知tan(α+β)=-2,tan(α-β)=1/2,求sin2α/sin2β的值