擅长初高中英语数学的人进.1、已知x,x'是方程x²+6x+3=0的两根,则x分之x'+x'分之x的值为?2、一元二次方程7x²-(m+13）x+m²-m-2=0的两根x,x'满足0＜x＜z＜x'＜2,求实数m的取值范围.3、解关于x

Question

擅长初高中英语数学的人进.
1、已知x,x'是方程x²+6x+3=0的两根,则x分之x'+x'分之x的值为?
2、一元二次方程7x²-(m+13）x+m²-m-2=0的两根x,x'满足0＜x＜z＜x'＜2,求实数m的取值范围.
3、解关于x的不等式x²-1≥a(a为常数）
1、Do let your mother know all the truth.She appears ____ everything
A、to tell B、to be told C、to be telling D、to have been told
2、The salesman scolded the girl caught____and let her off.
A、to have stolen B、to be stealing C、to steal D、stealing
3、The visiting Minister expressed his satisfaction with the talks,____that he had enjoyed his stay here.
A、having added B、to add C、adding D、added
4、Don't use words,expressions,or phrases____only to people with special knowledge.
A、being known B、having been known C、to be known D、known
5、I don't mean____you because what i have said really means____you to be good.
A、to hurt;to advise B、to hurt;advising C、hurting;advising
D、hueting;to advise
6、The mother didn't know____to blame for the broken glass as it happened whileshe was out.
A、who B、when C、how D、what
7、I considered____my job,but in the end i decided____.
A、to change;to do not B、changing;not to C、changing;not to change D、to change;not to
8、I would appreciate____back this afternoon.
A、you to call B、you call C、your calling D、you're calling
英语要求写出原因,

Answer 1

1.10 2.m小于-1 3.当a大于等于-1时,x可取任意实数；当a小于-1时,x无解
英语：DACDBABC 都是很常见的题,应该都见过两三次了,自己问老师吧.
数学解析：
1.用韦达定理可以求得：x×x'=a/c=3,x+x'=-a/b=-6
将原式通分,再把上边求的两个值带入即可,太麻烦就不打了
2.
3.解不等式得x^2≥a+1
①若a+1≥0,即a-1 ②若a+1＜0,即a＜-1
x可取任意实数 x无解