Math problems, please come in, math problems please come in

a=b∪a＝a

1'b is an empty set satisfying b a a

then =a 2-4(a 2-12)<0

3a^2+48<0

A>4 or A<-4

2'There is only one element in b.

then =a 2-4(a 2-12)<0

A>4 or A<-4

When a=4, b= satisfies b a a

When a=-4, b= does not satisfy b a a

So a=43'b= satisfies b a a

then the root and coefficient relations are used.

4-2=-a,a=-2

4*(-2)=a2-12,a=2 or a=-2, so a=-2

In summary, a>=4 or a<-4 or a=-2

a=solution a=

b a a so, b is a subset of a.

b=1.When x=4, bringing 4 into the equation of b yields:

a=-22.When x = -2, bringing -2 into the equation of b yields:

a=4 or a=-2 (at this time, when a=-2 is brought into b, x=4 or -2 is solved, not eligible, rounded).

So, a=

Solved by a gives x = -2 or 4

Because B a A, it can be divided into the following cases.

One, b is an empty set.

i.e. a 2-4 (a 2-12) < 0

Get a>4 or a<-4

Second, a 2-4(a 2-12) = 0 and -a 2 = -2 or a 2-4 (a 2-12) = 0 and -a 2 = 4 to obtain a = 4 three, a 2-4 (a 2-12) > 0 and (-a under the root number (a 2-4(a 2-12))) 2 = -2

or a 2-4 (a 2-12) > 0 and (-a under the root number (a 2-4(a 2-12))) 2 = 4

The solution is a=-2

I hope you can understand that it's a little difficult to write each one, oh, which step you can't understand, and then ask, hehe

Because x 2-2x-8 = 0

So we can get x1=4 and x2=-2

So a = substitute 4 and -2 into b

1.When x=4.

The solution is b=2When x=-2.

The solution is b = because b a a

So b is included in a

So a=done...

is a multi-millionaire. We're so rude.

If you save 1200 yuan in the first year, then this 1200 years will become 1200 (1+ 60 years later) 1200 (1+ ).

The 60th year is 1200

The sum slide shout is {1200 [( =.]

1200 times (1 + 12%) to the 60th power + 1200 times (1 + 12%) to the 59th power + 1200 times (1 + 12%) to the 57th power of the Lu Lu square +.1200 times (1 + 12%) to the power of 1 = 31212180 yuan.

Your title is fake, right!!

1. Choose A, firstly, the number of surveys is small, and secondly, the structure of investigators is non-random.

3. This is a box plot, the minimum value is 1, the maximum value is 9, the lower quartile is 3, the upper quartile is 6, the median is 4, the second quartile of a is tens of 300, the average value of the audience is not visible, the value range of the audience is 100 to 900, the median value shows that 50% is before 400, and the lower quartile is marked with 25% before 300, so get d

4, d, defined by the function, etc., the function represents a correspondence between each input value corresponding to the unique output value, 5, I don't understand what the question says, 6, transform the drawing, draw y=2x-6 straight line, the origin (0,0) does not match 2x-y>=6, so take the line below, draw the x=2 dotted line, take the right, overlap is the required area.

The fifth question of pan2626 is the correct solution, and the other questions are seen in the small 箬笠 .

A aNot random two.

I can't see the picture on my phone.

1. Choose A, not random, related to the industry.

8*1 8=1 64, this is a matter of probability, the probability of playing 2 times does not change.

It cost a total of 95 yuan. Each pen is more expensive than a notebook 2 yuan, 10 pens and 15 notebooks, all the pens are replaced with notebooks, you can also be less than 20 yuan, that is, 25 notebooks are 95-20 = 75 yuan, a notebook is 3 yuan, then the pen is 5 yuan.

Set: notebook x yuan pen x + 2 yuan.

10*（x+2）+15*x=100-5

Solution x = 3 pen x + 2 = 5

A: The unit price of a fountain pen is 5 yuan, and the unit price of a notebook is 3 yuan.

Notebook x yuan pen x + 2 yuan.

10*（x+2）+15*x=100-5

Solution x = 3 pen x + 2 = 5

The front is useful. Then ab=ac, and a=90°, so angle b=angle c=45° and angle ced=90°, so angle cde=45°=angle c and de=ce are proven.

Further, de=AD, and DCB=45°, CE=DE=AD is obtained, so CB=BE+EC=AB+AD.

tax = (4500-3500) yuan;

If you don't understand anything about this question, you can ask it, and if you are satisfied, remember.

If you have other questions, click to ask me for help after this question, it is not easy to answer the question, please understand, thank you.

Good luck with your studies.

The real salary is 4470

Pay 30 taxes But in fact, now wages are after taxes.

No tax is paid below 3500, and the part of 4500 exceeding 3500 is: 4500-3500=1000;

The excess part is paid 3%, and the tax paid is: 1000 * 3% = 30 yuan.

4500-3500) yuan.

Hope it helps.

Wang should pay personal income tax in September: (4500-3500)*3%=30 yuan.

The original price of this kind of clothes is x yuan, so the price of this kind of clothes after **15% is x (1 + 15%) = yuan). So fill in.

The price of a dress is X yuan, if the price of this kind of clothing is **15%, then the price of this kind of clothing after ** is indicated by letters).

** After the sale price of this clothing is:

1+15%)x