A point on a number axis that represents an integer is called an integral point. The unit length of a certain number axis is 1cm. If you draw a line ab of 2000cm at will on this number axis, Then the number of punctual points covered by line AB is a, 1998 or 1999 B, 1999 or 2000 C, 2000 or 2001 D, 2001 or 2002

A point on a number axis that represents an integer is called an integral point. The unit length of a certain number axis is 1cm. If you draw a line ab of 2000cm at will on this number axis, Then the number of punctual points covered by line AB is a, 1998 or 1999 B, 1999 or 2000 C, 2000 or 2001 D, 2001 or 2002

C. 2000 or 2001

It costs 440 yuan for mom to buy a suit of clothes. The price of a coat is 5 / 6 of that of a pair of trousers. How much is each coat? How much is a pair of trousers? (solved by equation)

If the trousers are set at x yuan, the jacket is set at 5x / 6 yuan
X+5X/6=440
11X/6=440
X=240
240 yuan for pants and 200 yuan for tops

Root (a + 9) - root a > root 3 to find the value range of a

Inequality can be reduced to: root (a + 9) > root (3) + root (a)
Because both sides are integers, the square of both sides is a + 9 > 3 + A + 2 * radical (3a)
Simplification: radical (3a)

2.07 cubic meters = () cubic meters () cubic decimeters

2.07 cubic meters = (2) cubic meters (70) cubic decimeters

A passenger car and a freight car set out from a and B at the same time, facing each other. The passenger car runs 80 kilometers per hour, and the freight car 65 kilometers per hour, 45 kilometers from the midpoint
Rice meet, seek distance

45 × 2 ÷ (80-65) = 6 hours, then 6 hours
6 × (80 + 65) = 870 km
A: the distance is 870 km

How to determine the specific gravity of stone, sand and cement in the calculation of concrete mix proportion by absolute volume method

This requires specific surface area
Cement is generally 2900-3100
Fly ash 2200
Mineral powder 2600
Shashi 2600
These are conventional, generally not practical, but also do their own apparent density test

What is the solution of 6-2 / 5x + 7 = - 4 / x + 17?

6-2 / 5x + 7 = - 4 / x + 17
-5/2x+1/4x=17-6-7
-10/4x+1/4x=4
-9/4x=4
x=4*(-4/9)
x=-16/9
X = 1 and 7 / 9

The height of a cylinder is 5 cm. If the height increases by 3 cm, the surface area of the cylinder will increase by 37.68. What is the volume of the original cone in cubic cm

Perimeter of bottom surface = 37.68 △ 3 = 12.56 (cm2)
Bottom radius = 1256 △ 3.14 △ 2 = 2 (CM)
Bottom area = 3.14 × 2 & # 178; = 12.56 (cm2)
Original cylinder volume = 1256 × 5 = 62.8 (cm3)

According to the following equation, arrange the four numbers a, B, C and D in descending order. (a, B, C and D are not 0) a × 56 = B × 32 = C × 45 = D × 38______ ＞______ ＞______ ＞______ What I found:______ ．

Let a × 56 = B × 32 = C × 45 = D × 38 = 1, then a × 56 = 1, a = 65 = 7260, B × 32 = 1, B = 23 = 4060, C × 45 = 1, C = 54 = 7560, D × 38 = 1, d = 83 = 16060, because 16060 ＞ 7560 ＞ 7260 ＞ 4060, that is 83 ＞ 54 ＞ 65 ＞ 23, so D ＞ C ＞ a ＞ B

It's urgent to solve a math problem in senior high school
Calculate: (sin65 + sin15sin10) / (sin25-cos15cos80)
I can't figure it out after half an hour or so. I guess I forgot something
I hope you can help me a lot. I don't want to spend any more time on this topic~

sin65+sin15sin10=
cos25+sin15sin10=
cos15cos10-sin15sin10+sin15sin10=
cos15cos10
sin25-cos15cos80=
sin25-cos15sin10=
sin15cos10
So (sin65 + sin15sin10) / (sin25-cos15cos80)=
cos15cos10/sin15cos10=cot15
The topic itself is not difficult, the key is careful
In addition, trigonometric function is a required question in the college entrance examination, and you can't lose points, so you must finish it by yourself