18.9x178.178+0.49-17.8x189.189

18.9x178.178+0.49-17.8x189.189=189x17.8189-17.8x189.189+0.49=(189x17.8+189x0.0189)-17.8x189.189+0.49=17.8x(189-189.189)+17.8x0.0189+0.49=17.8x0.0189-17.8x0.0189+0.49=0.49

What is the graph represented by equation (X & # 178; - 4) &# 178; + (Y & # 178; - 4) &# 178; = 0?

The square of a number should be the square of the number, which is greater than or equal to 0. So only when x \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\(1); =The figure represented by 0 is the four vertices of a square

The standard deviation of data 5015025035045055506507508509 is______ ．

The average of this set of data = (501 + 502 + 503 + 505 + 506 + 507 + 508 + 509) △ 9 = 2, variance = 19 [(501-505) 2 + (502-505) 2 + (503-505) 2 + (504-505) 2 + (505-505) 2 + (506-505) 2 + (507-505) 2 + (508-505) 2 + (509-505) 2] = 203, standard deviation = 203

How to calculate 501 + 502 + 503 + 504 + 505 + 506 + 507 by multiplication

504×7=3528

RELATED INFORMATIONS

1. 50 + 50 = 100, 500 + 5000 = 5500, 500000000 + 987687987.0987657890-789 + 98 =? Simple calculation
2. Question 1 (1-1 / 2) (1 / 3-1) (1-1 / 4) (1 / 5-1)... (1 / 2013-1) (1-1 / 2014) question 2 (1 / 9-1 / 8-3 / 16) * 48-35.75 * 2 4 / 5+（ Question 1 (1-1 / 2) (1 / 3-1) (1-1 / 4) (1 / 5-1)... (1 / 2013-1) (1-1 / 2014) question 2 (1 / 9-1 / 8-3 / 16) * 48-35.75 * 2 and 4 / 5 + (- 25 and 1 / 4) * (- 2 and 4 / 5) + 4.5 * (- 2 and 4 / 5)
3. 1+2-3-4+5+6-7-8+9+10-… +2014, how much?
4. After two price cuts, the retail price of a commodity is reduced to half of the original price. It is known that the percentage of two price cuts is the same. How about the percentage of each price cut? (accurate to 1%, 2 = 1.414)
5. The retail price of a certain commodity is 900 yuan per piece. In order to adapt to the market competition, the store decides to reduce the price by 10% and make a profit of 48 yuan. If the profit is still 20%, how much is the purchase price of this commodity?
6. A factory's profit (total output value total expenditure) last year was 2 million yuan. This year's total output value increased by 20% compared with last year, total expenditure decreased by 10% compared with last year, and this year's profit was 7.8 million yuan. How many million yuan were the total output value and total expenditure last year?
7. A factory's profit (total output value total expenditure) last year was 2 million yuan. This year's total output value increased by 0.2, total expenditure decreased by 0.1, and this year's profit is 7.8 million yuan. Last year's total output value, total expenditure is how many million yuan? Use one yuan equation!
8. The total industrial output value of a township last year was 2 billion yuan, so the population of the township is y (ten thousand people) and the per capita industrial and agricultural output value The total industrial output value of a township last year was 2 billion yuan, so the functional relationship between the population of the township y (ten thousand people) and the per capita industrial and agricultural output value x (ten thousand yuan) is, the functional relationship is It's urgent. Come on,
9. The total output value of a factory last year is 5 million yuan more than the total expenditure, and the planned total output value this year is 9.5 million yuan more than the total expenditure. It is known that the planned total output value this year is 15% higher than that of last year, while the planned total expenditure is 10% lower than that of last year. How much is the planned total output value and total expenditure this year?
10. China's per capita GDP was 1250.24 yuan in 1952 and 5196.5 yuan in 2004. What is the average annual growth rate of per capita GDP in these 52 years? How to calculate? Write the formula clearly What's the difference between your answers? It's 6.07% in the book
11. How to calculate 18.9x178.178 + 0.49-17.8x189.189?
12. Knowledge network of Biology Unit 5 in Volume 2 of Grade 7
13. Mathematics humor story
14. Some interesting articles about math Help
15. （2+4+6+8+… +196+198）-（1+3+5+… +195+197）
16. How to calculate 198 times 196 out of 197 in a simple way?
17. A simple algorithm for 202 * 198 / 199
18. How to calculate 72 * 202-2 * 76 simply
19. Ingenious calculation: the square of 2 + the cube of 2 + the cubic of 2 + the fourth power of 2 + the fifth power of 2 + the sixth power of 2 + the seventh power of 2
20. How much is 202 & # 178; + 198 & # 178;? It's better to write in detail