When Xiao Ming reads a book, the number of pages he has read is 32 of the number of unread pages. When he reads another 30 pages, the number of pages he has read is 73 of the number of unread pages. How many pages are there in this book?

When Xiao Ming reads a book, the number of pages he has read is 32 of the number of unread pages. When he reads another 30 pages, the number of pages he has read is 73 of the number of unread pages. How many pages are there in this book?

30 (73 + 7-33 + 2) = 30 (710-35), = 30 (110), = 300 (pages)

Xiao Ming read 140 pages the next day, 1 / 6 more than the first day. How many pages more than the first day?

Xiao Ming read 140 pages the next day, 1 / 6 more than the first day. How many pages more than the first day?
See more = 140-140 ÷ (1 + 1 / 6)
=140-120
=20 pages
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Xiao Ming's home is 4000 meters away from school. Xiao Ming goes to school and runs half the time
Xiao Ming's home is 4000 meters away from the school. When Xiao Ming goes to school, he runs 200 meters per minute in the first half of the time. In the second half of the time, he takes a car and the car advances 600 meters per minute. How many meters does Xiao Ming advance in the second half of the time?

Bus time x
200x+600x=4000
800x=4000
x=5
Car distance 5x600 = 3000m

Find the rules and fill in the blanks. 2 / 5, 2 / 7, 3 / 9, 4 / 11, ()（
Find the rules and fill in the blanks. How to fill in the brackets of two fifths, two sevens, three ninths, four fifths, (), (), ()

5/13

2A - (a + 1) + [(A-1) of (A-1) - 1]

2a-（a+1）+（a²-1）/（a-1）
=2a-（a+1）+《（a+1）（a-1）》/（a-1）
=2a-（a1）+（a+1）
=2a

How to calculate 7 / 85 * 86

86 divided into (85 + 1)

Finding the limit Lim x approaching 0 xsin (1 / x)
Complete process and results

Because LIM (x - > 0) x = 0
And | sin1 / X | ≤ 1
That is, sin1 / X is a bounded function
therefore
The product of infinitesimal and bounded function is infinitesimal
The original formula is 0

If the equations 2x + y = 3,3x-5y = 11 and x-2ay = 0 have a common solution, then the value of a
Detailed steps should be taken

Analysis: since the solutions of the above three equations are the same, the first two equations can be combined to solve the solution, and then the third equation can be substituted to solve a
2X + y = 3, 3x-5y = 11, the solution is x = 2, y = - 1,
Substitute the upper solution into the following equation
x-2ay=0
2+2a=0
a=-1

68 × 37 + 62 × 68 =? 328 × 63 + 328 × 36 × 328 =? Simple calculation method! Formula!

68×37+62×68
=68X（37+62）
=68X99
=6800-68
=6732
328×63+328×36×328
=328X(63+36+1)
=328X100
=32800
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Calculation: 9 ^ n * (- 1 / 27) ^ n + 1 * 3 ^ n + 2

9^n*(-1/27)^（n+1）*3^（n+2）
＝（3＾2）＾n*(-3^(-3))^(n+1)*3^(n+2)
=3^2n*(-3^(-3n-3))*3^(n+2)
=-3^(2n-3n-3+n+2)
=-3^(-1)
=-1/3