If the integer solutions of the system of inequalities about X {7x-m ≥ 0, 6x-n ＜ 0} are only 1,2,3, then there are several pairs of integers (m, n) suitable for the system of inequalities Referring to the answers of other netizens, some are 42 pairs, some are 5 pairs, and the answer of the original question is 36 pairs. I don't know which one is it? Please master to give the answer. Thank you! Online and so on!

If the integer solutions of the system of inequalities about X {7x-m ≥ 0, 6x-n ＜ 0} are only 1,2,3, then there are several pairs of integers (m, n) suitable for the system of inequalities Referring to the answers of other netizens, some are 42 pairs, some are 5 pairs, and the answer of the original question is 36 pairs. I don't know which one is it? Please master to give the answer. Thank you! Online and so on!

7x-m≥0 x≥m/7
6x-n＜0 x＜n/6
∴m/7≤x＜n/6
It can be concluded from the question setting that:
0 ＜ M / 7 ≤ 1 and 3 ＜ n / 6 ≤ 4
0 ＜ m ≤ 7, and 18 ＜ n ≤ 24
∴m∈{1,2,3,4,5,6,7}
n∈{19,20,21,22,23,24}
The combination of (m, n) is 7 × 6 = 42 pairs

The relationship between density and weight
Is the higher the density, the greater the weight!

That depends on certain conditions
Density = mass / volume
According to this formula, if the volume is the same, then the greater the density, the greater the mass; and if the mass is different, that's another matter!

There are 24 tons of cement, three eighths of which were used in the first time and one third in the second time. How many more? How many more tons were used in the first time than in the second time?

24X(1-3/8-1/3)=7
24X(3/8-1/3)=1
Please click "select as satisfactory answer"

The bottom diameter of a cylinder is 2 decimeters, the surface area is 12.56 square decimeters, and the height of the cylinder is______ Decimeter

Bottom area: 3.14 × (2 △ 2) 2 = 3.14 (square decimeter), side area: 12.56-2 × 3.14 = 6.28 (square decimeter), height: 6.28 △ 2.14 × 1, = 6.28 △ 6.28, = 1 (decimeter); answer: the height of the cylinder is 1 decimeter

A number, which is a factor of 16 and a multiple of 16, what is the number?

It's 16
16 divided by 16 multiplied by 16 ～

Let a = 2x2-3xy + Y2 + x-3y, B = 4x2-6xy + 2Y2 + 4x-y, if | x-3a | + (y + 3) 2 = 0, and b-2a = A. find the value of A

This is the case of a = a = 2x2-3x2-3xxy + Y2 + x-3y, B = 4x2-6xy + 2Y2 + 2Y2 + 2x2 + 4x2-6xy + 2Y2 + 2x2-3x2-3x2-3xxy + Y2 + x-3y, B = 4x2-6x2-6xy + 2x2 + 2x2-6xy + 2x2 + 2x2-3x2-3x2-3x2 + 2x2-6xy + 2y22 + 2x2 + 4x2 + 4x2 + 4x2 + 4x2 + 4x2-2x2-2x-3-y, and 124124124\\124\\\\\\\\\\\\\\\\124= 162 + 81 + 9 + 9 + 9 = 270

According to 4.5.7.812.24.32.56.60.120. These numbers: (1) write four formulas with multiple relations
Please refer to 4.5.7.812.24.32.56.60.120
(1) Write out four formulas with multiple factors
(2) The factor of 60 is () and the multiple of 12 is ()

1.32÷8=4
60÷12=5
56÷8=7
120÷5=24
(2) The factors of 60 are (4,5,12,60) and the multiples of 12 are (12,24,60120)

The process of decomposing 2x ＾ 3-4x ＾ 2y-x ＾ 2Z + 2XY ＾ 2 + 2xyz-y ＾ 2Z

2x＾3－4x＾2y－x＾2z＋2xy＾2＋2xyz－y＾2z
=(2x^3-4x^2y+2xy^2)-(x^2z-2xyz+y^2z)
=2x(x^2-2xy+y^2)-z(x^2-2xy+y^2)
=2x(x-y)^2-z(x-y)^2
=(x-y)^2(2x-z)

The difference between a and B is 9.9. Move the decimal point of a to the left one place, which is exactly equal to B. is a? Is B?

B 9.9 (10-1) = 1.1
A 1.1x10 = 11

If the system of linear equations {x + y = 1, X-Y = a, satisfying a > y, then the value range of a is

X+Y=1,X-Y=a
So 1-2y = a
a> Y is a > (1-A) / 2
So a > 1 / 3