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函数f (x )X²+2X-3,X≤0 ㏒10 X -1,X>0 的所有零点之和为? m为何值时,关于x的方程x-1/x-2=m/x-1+1无解,求m的值 y=ax2的自变量x由2增加到3时 函数值减少了25 求这个二次函数的解析式 已知二次函数y=ax2+bx+c中 a≠0 中自变量x和函数值y的部分对应如下表x 负的三分之二 负一 负二分之一 0 二分之一 1 二分之三y 负的五分之四 负二 负四分之九 负二 负四分之五 0 四分之七则该 若关于X的方程X－2／X－3＝M／X－3＋2无解,则M的值是,为什么? South Korea's sunken ship drowned 288 passengers,__________16 more still missing A left B leaving c having left D to leave 求答案和原因 当m取什么值时,关于x的方程x/(x-3)-2=m.m/(x-3)无解?为什么? 一个英文题.Jack昨天晚上读看了这本书.Jack( )( )the book last night.坐等, ,特别是里面的语法错误!There are many students with short-sightness and we have conducted a survey on students' eyesight among primary and middle schools.The result was really worrying.It shows that 80 percent of the students are shortsighte 大家来看看这篇英语作文有没有语法错误,On May 29th,we had an English class.The teachers were Piewrre and another teacher.In class,Mr.Piewrre described him and we asked him some questions what we wanted to knew.When he thought his or h 有一个英语题请帮忙.你能帮我查一下飞往北京的航班号吗?Can you help me look up the flight number to Beijing ?这里为什么用lookup?为什么不用check out ? he often sleeps with the door ____ and the window ____.A,close;openB,closed;openedC,closing;openingD,closed;open答案说选最后一个,我不懂为什么close在这里是动词,而open是形容词?谢谢热心朋友的回答! 请给我看一下这篇英语作文,改一下语法错误,Nowadays,Shanghai is really an attractive city with many landmarks.Every year,many visitors come to visit Shanghai.If someone comes to Shanghai,he may go to the Oriental Pearl TV Tower.It’s 关于汉语热的英语作文麻烦帮我修改一下语法错误As an international language ,English can be seen anywhere ,However ,at present ,it raises a storm of foreigner’s learning Chinese at home and abroad .The heat is still going up.What 求修改 英语作文语法错误One day,Marie to prepare some food to go to picnic with her friends.When they arrived at the forest,they found that the trees are cut and a bird without.So they are very frustrated and go home,but Marie in the woods. 高一数学必修四的难题汇总谁有不需要太多,经典就行,谢谢啦! 英语作文修改(尤其是语法错误）Is money everything ?As it is firmly believed that money is very essential to us. Having money we can live in luxurious house, eat senior food, travel to wherever you like. However, since money can bring us 直角三角形全等的判定在RT三角形ABC中,角C=90度,BD平分角ABC交AC于点D,若AC=10,AD=6求点D到边AB的距离 在必修四刚学三角函数的时候有一类题是说,若a是第一象限角,它会叫你求2a,a/2,a/3分别是什么象限的角.拿a/2和a/3来说,求写出a/2的集合后,它会讨论让k=2n,或k=2n+1.若是a/3的话,它就会讨论k=3n,k=3n+1 高一数学必修4难题（向量）三角形ABC内接于圆O,其中AB=4,AC=3,求向量OA×向量BC的值,答案是-7/2 练习所出现的内容章节是向量的数量积.‍ 高一数学人教版必修4难题解决求证:1+sinA-cosA/1+sinA+cosA=tanA/2 ,特别是里面的语法错误!In the story dream is very important todifferent character,they have all kind of different dreams,and dreams alsogives them kind of different motives.Dreams seems more important to nobody whoat the lower class,it keeps 两个直角三角形可以用边边角证明全等吗? 我们都知道直角三角形证明全等可以用HL,即是一条斜边与一条直角边.我想问,能不能用两条直角边相等证明.如不行,恳请留下理由. 证明直角三角形全等的条件 证明直角三角形全等.两个直角三角形斜边相等,其中一条直角边也相等,为什么这两个直角三角形就全等了, 若关于x的方程ax+b=0是一元一次方程,则a.b的取值范围分别是多少? ax的二次方+bx+c=o是一元一次方程,则a,b,c的取值范围分别是多少? 若关于x的方程ax+b=0为一元一次方程,则a的取值范围是? sin4θ+cos4θ=1 sinθ+cosθ=?参考答案是正负一。怎么搞的 已知sin^2(x)+cos(x)+m=0有实数解,求m范围sin^2(x)是sin(x)整个的平方 方程x－2x-5＝0,x＝x,y－3x＝2,x＝0中,一元二次方程有几个