The first dice rolls 2, the first dice rolls 5, and the sum of points is 7;
……
* * * There are six ways to roll dice, and the sum of points is 7.
(2) There are five situations: if the sum of the thrown points is 6, there are five situations;
There are four situations in which the sum of throwing points is 5;
There are three situations in which the sum of throwing points is 4;
There are two situations in which the sum of throwing points is 3;
The sum of the minimum points thrown is 2 1, and * * * has 15.
2、B
3. Suppose there is X yuan, the first beggar's X- money-the second beggar's money =5.
X—( 1/2X+2)—[ 1/2(X—( 1/2X+2))+4]= 5
X=40
4. You can exchange three empty bottles for one bottle, that is to say, if you buy three bottles, four people will have water to drink, then if you buy 2 1 bottle, you can exchange seven bottles, so that 28 people will have water to drink, and the remaining seven bottles can be exchanged for two bottles, all of which have water to drink, leaving one bottle.
5、
Is there a god of mathematics? I can't solve math problems, so I can't work out the formula. Thank you. It depends on logical thinking. Find the other side of 5 (20-3x2)÷2=7, and then 7x5x3= 105.
Is there a god of mathematics? How to solve this problem, there should be at least one problem. It's like practicing dog sticks. You should at least have a stick.
Your IQ is not enough to ask questions. So go back to your Mars. The earth is very complicated.
I don't understand why so many people in Baidu who know how to ask questions have zero IQ, but they are so persistent in getting money from the Civil Affairs Bureau.
Is there a god of mathematics? Want to ask a math problem, the great god asks for advice;
1+ 1=2
1+2=3
2+3=5
PS:
1+2+3+...+ 100=5050
Is there a god of mathematics who stays up late in the bar? If the topic of seeking truth is (1) xy'-ylnx = 0xdy/dx = ylny, dy/(ylny) = dx/x, ln (lny) = lnx+lnc, lny = CX, then the general solution of the differential equation xy'-ylny=0 is y = (2) sin. dy/cosy+dx/sinx = 0 = = & gt； ∫dy/cosy+∫dx/sinx = 0 = = & gt； Ln │ secy+Tany │-ln │ cscx+cotx │ = ln │ c │ (c is a nonzero constant) => (secy+Tani)/(cscx+cotx) = c = = > Secy+tany=C(cscx+cotx)∴ The general solution of this equation is SECY+Tany = C (CSCX+COTX). (3)xy ' = y(lny-lnx)xy '/y = lny-lnxx(lny)' = lny-lnxx(lny)'-lny =-lnx[x(lny)'-lny]/x？ =-(lnx)/x？ [(lny)/x]'=-(lnx)/x？ Integral on both sides: (lny)/x=-∫(lnx)/x? dx =∫(lnx)d( 1/x)=(lnx)/x-∫( 1/x)d(lnx)=(lnx)/x-∫( 1/x)。
Ask the great god of mathematics to do some math problems! So much is still a big problem. . . . Zizhi, you are self-reliant.
Ask the god of mathematics to help me solve some math problems. My solution is slightly different from the two upstairs. My idea is:
(1) analysis: the net profit per piece is: price 14- cost 10=4 yuan.
Because the daily fixed cost is 140 yuan, it is necessary to produce 140/4=35 pieces in order to break even (that is, not lose money).
Then if you produce less than 35 pieces a day, you will lose money, and if you produce more than 35 pieces, you will earn money.
Solution: Assume that the daily output of X pieces can break even.
Then (14-10) x =140.
X=35
Then 35 products can be produced to break even.
According to the meaning of the question, if more than 35 products are produced, there will be a surplus, and if less than 35 products are produced, there will be a loss.
(2) Analysis: The total profit of 40 pieces minus the fixed cost 140 yuan is the surplus, that is, the surplus is ≥ 180 yuan.
Solution: let the price of a single piece be y yuan.
Then (y-10) x40-140 ≥180.
40Y≥720
Y≥ 18
The unit price of the product is 18 yuan, which is just a surplus 180 yuan; If the unit price of the product is higher than 18 yuan, the daily surplus exceeds 180 yuan.
If you have any questions, you are welcome to correct them!
Ask me other questions and I'll help you solve them at the first time!
It's not easy to answer the question, so the landlord adopts it!
Are there any math geniuses who can solve primary school math problems? Number of girls = 1. Boys = 1.8, and the average score of boys is x2.8× 75 =1.2x+1.8x = 70.
Average score of girls =70× 1.2=84.
Option a is correct.
A math problem, ask the great god of mathematics to help me analyze it: leave one for two, one for four, one for six, one for eight, one for ten and one for twelve; Then, the total number of Uncle Yi's eggs must be odd.
Conclusion: Fourteen numbers are just calculated, which is impossible. Because the multiple of 14 is even.
Is there a god of mathematics? Help, [(1+52.8) × 5-3.9343] ÷ 0.5-10.
=[53.8×5-3.9343]÷0.5- 10
=[269-3.9343]÷0.5- 10
=265.0657÷0.5- 10
=530. 13 14- 10
=520. 13 14