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Female student undecided a b a de b b ce cghj

I like jewelry the most, why don't I have jade? I like jade the most. I'm funny, take the time to fill it out, and reward me!

Basic Information:

Gender: Male Industry: Civil Servant Position: Section Member.

Age: Average Monthly Income Before Taxes:

Questionnaire content: 1aHave you ever bought jewelry?

a Yes (continue questionnaire 2a).

2a.How often do you buy a piece of jewellery (or once)?

cHalf a year 3aWhich of the following malls have you ever bought jewellery from? (Multiple choices) are none. 4a.Which of the following brands have you bought jewellery from? (Multiple choices)a Chow Tai Fook.

5a.Which of the following options is an important factor in determining whether or not you want to buy a piece of jewelry? (You can select more than one).

e.Style JRecommended by a friend.

6a.In which of the following situations would you prefer to prioritize your jewellery purchase? (Multiple selections) aGift-giving bJust like.

7a.Which of the following price points would you accept?

8a.What texture of jewelry do you like? (Multiple selections) cPlatinum jade.

9a.Which of the following jewelry items do you prefer? (You can select more than one) fCrystal hOnyxPearl.

1.A contains B

The solution is a=b=, and when x=2, we can get 4+4(a+1)+(a-5)=0 to get a=-1 or =-3

2) a b=a, i.e. a contains b, i.e. b= or b= or b= or b= or b= empty set When b=, there is only one solution in the equation x +2(a+1)x+(a -5)=0, which can be solved by (x-1) =0 to get x -2x+1=0 so a+1=-1 and a -5=1 so a=-2 When b=, there is only one solution in the equation x +2(a+1)x+(a -5)=0, which can be solved by (x-2) =0 to get x -4x+4=0 so a+1=-2 and a -5=4 So a=-3 When b=, there are two solutions in the equation x +2(a+1)x+(a -5)=0, which can be solved by (x-2)(x-1)=0 to get x -3x+2=0 so a+1= and a -5=2 so a=

When b = empty set, there is no real solution in the equation x + 2 (a + 1) x + (a -5) = 0, according to <0, can.

A<-3

In summary, the value range of a is a<-3 or a= or a=-3 or a=-2

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