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In April of this year, Mr. Wang bought 3000 shares at 10.56 yuan per share, and paid 0.2% and 0.2% commission respectively. From May of this year, the State stipulated that the Commission was 0.3% and 0.3%. On May 19, Mr. Wang sold 3000 shares at 13.8 yuan per share. How much did Mr. Wang earn? 2. The number of boys in a class accounts for 55%, and 66% of the class participate in the math interest group. Among them, 72% of the boys participate in the math interest group, and what percentage of the total number of girls do not participate? There are 45 people in a class. Choose a monitor from the two. Among them, 40 people agree with a and 37 people agree with B. the number of people who all agree is one ninth of the number who all agree. How many people do you agree with and disagree with? The above problem had better not use the equation solution, if the column equation can only use 1 unknown number Wrong number There are 45 people in a class. Choose a monitor from the two. Among them, 40 people agree with a and 37 people agree with B. the number of people who disagree with all is one ninth of the number who agree with all. What are the number of people who agree with all and who disagree with all?
1. Total cost: 10.56 * (1 + 0.2%) * 3000 = 31743.36 yuan
Remaining after sale: 13.8 * (1-0.3%) * 3000 = 41275.8 yuan
Then make money: 41275.8-31743.6 = 9532.2 yuan
2. Female students account for 1-55% of the class = 45%
The number of female students participating in mathematics interest group accounts for 1-72% = 28%
The number of young girls who participated in the math interest group accounted for 28% of the class * 66% = 18.48%
The number of female students who did not participate accounted for 45% - 18.48% of the total number of the class = 26.52%
3. If the total number of people who disagree is x, then the total number of people who agree is X
(37+40)-(45-x)
x/((37+40)-(45-x))=1/9;
The solution is x = 4;
The total number of people who disagree is 4, and the total number of people who agree is 36
As shown in the figure is a parabola shaped bridge arch, two data are measured and drawn on the paper. Xiao Ming said that as long as an appropriate coordinate system is established, the parabola expression can be obtained. Do you think his statement is correct? If it is not correct, please explain the reason; if it is correct, please help Xiao Ming find the parabola expression
Correct. The parabola varies according to the coordinate system, as shown in the following figure. (two examples only)
Giving points to math problems~
How simple and how to calculate! 14 / 15 ^ {(12 / 15 plus 10 / 15) times 10 / 11 2. I have typed 1600 words, which is exactly 40% of the full text, Only 5% of the students are not covered by accident insurance. How many students are covered?
Don't answer directly, just calculate the process!
&There are 4000 words in the full text, which are 14 of 15 ÷ (12 of 15 + 10 of 15) × 10 of 11 & nbsp; = (14 of 15 × 15 of 12 + 15 of 14 × 10 of 15) × 10 of 11 & nbsp; & nbsp; & nbsp; = (7 of 6 + 7 of 5) × 10 of 11 & nbsp; & nbsp; & nbsp; = 2 and 12 of 3, 3. 480 × (1-5%) & nbsp; = 480 × 95% & nbsp; = 456 (people) 456 students are insured
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