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在光下面写作业对眼睛有什么不好 背对着太阳写作业对眼睛好吗?写作业时间长了,眼睛时时有些疼痛………应该怎么办啊! 翻译:他把口香糖吐在地上.他排队排在第一个 “我想呕吐”用英语怎么说急用急用！........... x^4+x^40=237 求X 椭圆x^2/25+y^2/16=1上一点p到左焦点距离为6,若点M满足→OM=1/2（→OP+→OF）,则|→OM|=?如题 过程 5x+2y=17.5 8x+4y=32 方程组 他过去总喜欢在课堂上大嚼口香糖 English回答 从原点向圆x^2+y^2-12x+27=0作两条切线,则这两条切线的夹角大小为 已知椭圆x^2/4+y^2/2=1,有动点P满足向量OP=向量OM+2向量ON,其M,N中是椭圆上的点,O点为坐标原点,直...已知椭圆x^2/4+y^2/2=1,有动点P满足向量OP=向量OM+2向量ON,其M,N中是椭圆上的点,O点为坐标原点,直线OM 从原点向圆x∧2＋y∧2－12x＋27＝0引一条切线,则这条切线长为多少 考研英语分一二三吗? 2x-0.24=0.12怎么理解 (24-2x)(12-2x)=24x12x9分之五怎么做 已知椭圆E的短轴长为6,焦点F到长轴端点的距离为9,则他的离心率为. X^2+1/x^2-3(X-1/X)-12=0 阅读理解填词 (English）today is Saturday .But many people don't go out to S_____the weekend ,because it's snowing heavily.i is c_____ outside.On such s_____ days,most people l____ staying at home.Susan with her children stays in the warm house 4275一240÷16×5.脱式计算,谢过 解方程 4分之1乘以（2x-3）的三次方=2乘以3的三次方 叙述明晰. 脱式计算 240÷5－3×16怎么计算 英语：1篇阅读理解填词.Can a boy have a MAMA and not a MOTHER?Tex Clark did.He didn’"t have a r 1 home.His father and mother were dead.He had to work from an early a 2 .Then one day a circus (马戏团) found him and let him j 3 it.He was 缠中说禅的新笔定义和旧笔定义有何区别?缠师为什么要修正笔的定义?那缠论懒人路线图的起点又是什么?可以这么随便的放过笔吗? 缠中说禅 关于笔的划分1和2中间的为啥不算? 缠中说禅中的上笔指的是什么 缠中说禅笔的问题这个图有多少笔,分别在哪里? （急!）英语 one day a little dog went out for something to eat.he looked here and there.after a few minutes,he f two pieces of mest.he was very h.he picked up the meat and ran a quickly.when he w onto a bridge,he looked down into the river.he sa 2x^2+7x+5乘以x^2-2x-3怎么算 解（x+9.5）/2*6.5-（x-9.5）/2*6.5=13 计算：(2x)^3乘以(1/2x)^2 x-13-6=(x+6)×0.5 我会给高评分的! 9.5-2.6=13.8除x, 数学不等式：若-1