One math problem, one math paper

Yuan. Yuan 500 + 1600 = 2100 yuan.

3.Set up grandpa to Lele x yuan.

1+,68%)*x=

x=496,87

Question 3... After saving for a year, the money is calculated according to the principal and another year of interest. Or is it based on the principal interest and interest of the first year? If it's the first one, then count as follows.

x*x=meta. 5.(1) 10,000*.

2) 10000*(1+RMB.)

A: The second one is good.

7.(3600-800)*14%=392 yuan.

1.156,000 yuan.

2.2100 yuan.

3.Yuan. 4.Yuan.

5.(1) Yuan.

2) Yuan So the second one is good.

7.392 yuan.

A math exam that couldn't be easier.

Because. tana = sina cosa = -5 12 so. cosa=-12/5 *sina

Since sina 2 + cosa 2 = 1

There is substitution. sina^2+144/25 sina^2=1sina^2=25/169

Since the angle is four quadrants, the sine is negative.

sina=-5/13

Answer: (1) If you buy tickets for 12 people, it will cost: 8 * 20 + 4 * 10 = 200 yuan.

2) If you buy a group ticket, you need to buy 16 tickets, which will cost 16*20*RMB.

So: you should buy a group ticket, which costs the least at 192 yuan.

Say 12 people buy 16 tickets, yes.

24 people participated in the mathematics competition, 28 people participated in the physics competition, and 19 people participated in the competition to participate in the chemistry competition, indicating that a total of 71 people competed, 24 + 28 + 19 = 71 (person-times).

There are 7 people who participated in the mathematics, physics and chemistry competitions, indicating that there are 7 people who participated in the three events, and these 7 people have repeatedly calculated 3 times, and the 2 times of extra calculations should be removed, that is, 14 people.

Only participate in mathematics and science of 5 people, to remove the overcounting of 5 people, and so on, a total of 7 * 2 + 5 + 3 + 4 = 26 (in the number of people) in the repeated calculation, to get the number of people who participate in the competition 71-26 = 45 (people), there is no Ling Xishan to participate in the competition is 48-45 = 3 (people).

The total number of participants in the competition = 24 + 28 + 19-5-3-4-2 * 7 = 44

= 48-44 = 4 for those who did not participate

Hello 100 pcs.

Backwards 10 [(1-1 2) (1-1 3) (1-1 4)...1-1/10）]

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Since a x>0, a x+1>1, so the domain of f(x) is r;

Since f(x)=(a x-1) (a x+1)=1-2 (a x+1), because a x+1>1, 0<2 (a x+1)<2, so -2<-2 (a x+1)<0, so -1 so the domain of f(x) is r, and the range is (-1,1);

This is a question with equal probabilities, and the number of "multiples of 2" and "multiples of 3" is equal to the number of hailstones, that is: fill in 4 is only a multiple of 2, and 4 is only a multiple of 3 (do not fill in a multiple of 6, so as not to confuse Liang Fan). The specific value and the location are arbitrary.

For example: 2,4,8,10,; 3,9,15,21

If you must fill in a multiple of 6, please fill in an even number (2 or 4 or 6 or 8) for the slag ball

It doesn't matter where the area is the same.