【简答题】(1)已知y(x+y)+(x+y)(x-y)-x 2 ,其中x=-2,y= ; (2)化简:(x+3y)(2x+y)-(x+2y) 2 -(2x-y)(2x+y).
【简答题】阅读理解。 Have you ever shopped in Beijing? Do you know bargaining (A) is the rule there? At least, it is so in most markets and back-street clothes shops. Bargaining is an art and if you are unfamiliar (...
【单选题】Which of the following statements describes a scenario in which the bargaining power of a supplier is strong?
A.
Competitors have decreased demand for raw materials.
B.
The availability of raw materials is limited.
C.
The supplier has excess inventory.
D.
There are many suppliers providing the same raw materials for comparable prices.
【多选题】从历史长过程看,我国经济发展历程中( )总是在不断形成,经济发展新常态是这个长过程的一个阶段。这完全符合事物发展螺旋式上升的运动规律。
【多选题】下列()程序段可以实现X、Y两个变量的值互换。
【简答题】(-x-y)(x-y)=______(x+y)(y-x).
【单选题】下列等式成立的是( )
C.
-x 2 +y 2 =(-x+y)(-x-y)
D.
-x 2 -y 2 =-(x+y)(x-y)
【简答题】对任意两个集合X、Y,定义X-Y={x|x∈X且x?Y}、X△Y=(X-Y)∪(Y-X).设A={y|y=x 2 ,x∈R},B={y|y=3sinx,x∈R},则A△B=______.
【单选题】(122--124题共用题干) 患者,女性,38岁,孕2产1,2年前产钳分娩。现长时间站立、下蹲后腰背酸痛有下坠感,清洗外阴可及一肿物。妇科检查:可看见宫颈已脱出阴道口,宫体仍在阴道内 诊断为子宫脱垂几度