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一道很简单的关于函数的高中数学题,详解,关于x的方程cos²x+sinx-a=0有实数解,则实数a的最小值是 创新跟合作 议论文名人事例 快 时间关系没法清楚拍摄 但应该看得清,求速度 已知函数f（x）=ln（x+1）-ax/(x+1) 当x＞0, 1/ln(x+1) — 1/x＜1/2, 求x的取值范围 甲车以5m/s的速度通过A点,乙车恰好以10m/s的速度也通过A点.过A点后甲车保持匀速,过A点后乙车以0.5m/s^2的加速度做匀减速运动.求：①过A点后通过多少秒时两车相距最远?最远距离是多少?②过A 已知某曲线的方程为x^2+y^2+2x+2y+1=0,点（x,y）是其上任意一点,求xy的最值 英语 1111He’s ______as a “bellyacher” –he’s always complaining about something.A.who is known B.whom is knownC.what is known D.which is known 答案为何是c 半径20cm的竖直放置的半圆轨道BDC与水平直轨道AB在B点相切连接,动摩擦因素都为0.2,一个质量为50g的物体受恒定水平向右的力0.5N作用后,从A点开始由静止加速度到半圆最低点B,然后撤去垃圾,物 平面内作用于同一点的四个力若以力的作用点为坐标原点,有F₁=5N,方向沿x轴的正方向；F₂=6N,沿y轴正方向；F₃=4N,沿x轴负方向；F₄=8N,沿y轴负方向,以上四个点的合力方向指向A. Dirty secrets make friends什么意思.我英盲不要字表的意思.WORKING MACHINE dirty secrets make friends? dirty secret make friends这句英文是什么意思啊? Dirty secrets make friends it keep the city alive shanghai is a huge cake with poison “Dirty secret make true friends”什么意思?在小时代里看来的 THE TRUTH ABOUT THE NEW RULES OF BUSINESS WRITING怎么样 of what importance are rules of origin to international businessthe importance of rules of origin to international business? their business don't f__ other people's rule首字母填空 The golden rule of corporate hospitality is to turn every social event to business advantThe golden rule of corporate hospitality is to turn every social event to business advantage golden rule （注意这是剑桥商务英语里的内容 请回答 高一数学必修5不等式难题1.已知4/3＞X＞0,求X（4-3X）的最大值.点（X,Y）在直线X+2Y=3上移动,求2的X次方+4的Y次方的最小值. 19题, 对于英语不好的,选文科好还是理科好? 理科和文科怎么选 我化学不好,英语和语文很好,不过我历史和地理不太好.要分科我该怎么选择我大学打算学财经或者外语.我想文科理科哪个比较好考进财经大学和外国语大学...化学我基本 英语好数学不好选文科还是选理科文科比较好点.喜欢英语且成绩也挺好,但不喜欢背政治.但数学比较糟,即使很用功但数学成绩还是很一般!纠结~ 我读重点中学是高一学生.我们级里1200人,我这次月考掉进了1000大关,因为我数学很烂只有27分倒数第二,英语也很烂45分,语文97（150分制）说实话应该是我高一第一学期整个学期加上这一学期初 英语翻译Barry Manilow-Looks Like We Made It There you are Lookin' just the same as you did last time I touched you And here I am Close to gettin' tangled up inside the thought of you Do you love him As much as I love her And will that love be str I like to make friends. 初一英语阅读题. Must rely on their own,believe in yourself,refueling是什么意识? 初一英语阅读题.有点多.不要介意, Believe in yourself什么意思? 一篇初一英语阅读理解, believe yourself和believe in yourself 有什么区别?RT.