Xiao Gang read a story book. He planned to read 39 pages a day and finish it in 30 days. Actually, he finished the book in 26 days. How many pages a day on average?

39 times 30 divided by 26 equals 45

For a story book, Xiaogang reads 1 / 5 less pages per day than Shasha. It takes 8 days for Shasha to finish the story book. How many days does Xiaogang finish the story book
Air passengers can bring 20kg luggage free of charge, more than 1.5% of each kg to buy a luggage ticket, grandfather brought 30kg luggage ticket, total pay 1035 yuan, how much is the ticket
No one

If Xiaogang reads a page every day, then Sasha reads 5A pages every day. That book has a total of 5A * 8 = 40A pages. It takes Xiaogang 40 days to finish this book
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The sum of weight of Xiaoming and Xiaoliang is 53 kg, the sum of weight of Xiaoming and Xiaogang is 55 kg, and the sum of weight of Xiaogang and Xiaoliang is 58 kg?

(53 + 55 + 58) △ 2 = 83kg
Xiaoming 83-58 = 25kg
Xiaoliang 83-55 = 28KG
Xiaogang 83-53 = 30kg
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I don't know what I shall do next

I don't know what I shall do next
I don't know what to do next.

It is known that the quadratic equation of one variable kxx-4x + 2 = 0 with respect to X has real roots, and the value range of K is obtained

Delta = 16-8k ≥ 0, K ≤ 2, and K ≠ 0

Application of quadratic equation of one variable
There is a new car with a value of ￥ 300000. Two years later, the value of the car drops to ￥ 180000. It is known that the annual depreciation rate will gradually decrease. If the difference between the depreciation rates of the first two years is 5% (the depreciation rate of the first year - the depreciation rate of the second year = 5%), calculate the depreciation rate of the first year

Suppose the depreciation rate of the first year is x, then the depreciation rate of the second year is X-5%. According to the topic meaning, 300000 (1-x) [1 - (x-0.05)] = 1800005 (1-x) [1 - (x-0.05)] = 35 [1-x - (x-x & # 178; - 0.05 + 0.05x)] = 35 (1-x-x + X & # 178; + 0.05-0.05x) = 35 (X & # 178; - 2.05 + 1.05) = 3x & # 178; - 2.05 + 1.0

A swimming pool covers an area of about 500 square meters

Square meter

[39-26 / 27] x 1 / 13, how about it?

[39-26 / 27] × 1 / 13
= 1 / 39 × 13-1 / 27 × 26 × 13
= 2 / 3-27
= 2 and 25 / 27

Mr. Liu went to the bookstore to buy books. Because of the large quantity of books, the shopkeeper gave a 20% discount. Therefore, Mr. Liu could buy five more books with 120 yuan. What was the original price of this book?

120 × 20% / 5% / 80% = 24% / 5% / 80%, = 4.8% / 80%, = 6 yuan. A: the original price of this book is 6 yuan

If there is a series of numbers: - 2003, - 1999, - 1995, - 1991, arranged according to certain rules, then the sum of the first () numbers in the series is the smallest
A. 500B. 501C. 502D. 503

This series of numbers: - 2003, - 1999, - 1995, - 1991,?, is an arithmetic sequence, the largest negative number is - 3, [(- 3) - (- 2003)] 4 + 1 = 501, so select: B

Xiao Gang read a story book. He planned to read 39 pages a day and finish it in 30 days. Actually, he finished the book in 26 days. How many pages a day on average?