The questions of the junior high school, a few questions of the junior high school exam

According to the title, if you read 10% every day, it will take you 10 days to finish reading. But he read 6 more pages a day, and the day was finished, and it took less time. And this time is the sum of the number of pages he reads every day, ie.

These 57 pages make up 1-10% of the total book, i.e. the number of pages in the book should be 20 times that of 57, so a total of 1140 pages. Then he reads 1140x10%+6=120 pages a day.

Suppose this book has x pages, read 10% x + 6 pages a day According to the title: (10% x + 6) · Get x = 11140

So he reads 10% ·1140 + 6 = 120 pages a day.

(1).21*4-4=80

2).28.The closer the two numbers are, the greater the product. So a=28, b=1

This fruit shop originally had apples x kilograms.

1-1/8)x=1800-x+600

x=1280

This fruit shop originally had 1,280 kilograms of apples.

I read half of the book on the first day. The next day, the remaining half of the independence is missing six pages, then the next day I read 1 2*1 2=1 4, and there are still 6 pages missing, so the remaining 24 pages are 1-1 2-1 4=1 4, and there are 6 more pages, so 1 4 is 24-6=18 pages. The book has 18 * 4 = 72 pages, and the book has 72 pages.

1.Set apple x, pear y

x+y=1800

7x/8=y+600

x=1280

y = 520 pages is the remaining half plus 6 pages.

The total number of pages is.

Let the apple x catty (1800-x+x 8)+600=x*7 8

Make the book x pages.

If the hourly water outlet of each outlet pipe is 1 unit, then the hourly water inlet of the inlet pipe is equal to (3*18-8*3) (18-3)=2 units, then (18+8*2)*8=17 4, so that at least 5 pipes are required.

The solution of proportions:

3x6) 9+2=4 (root).

Engineering solution: 1 3-1 6) x1 3 = 1 18

5-(1 6-1 9) (1 18) = 4 (root).

8-(1 3-1 9) (1 18) = 4 (root).

1/3-1/6）x1/3=1/18

1/18x8-1/3=1/9

1 9 + 1 9) (1 18) = 4 (root.