The sum of the maximum factor and the minimum multiple of a number is 30. The number is ()

The sum of the maximum factor and the minimum multiple of a number is 30. The number is ()

Both the maximum factor and the minimum multiple of a number are itself, so 30 is twice of it
The number is 15
30÷2=15
The number is (15)
This number is 15, because the maximum factor is itself, and the minimum multiple is itself, so 15 + 15 = 30, this number is 15.
Mother went to the supermarket and bought seven bottles of drinks
Mom went to the supermarket and bought 7 bottles of drinks, which cost 20 yuan. Farmer's orchard costs 4 yuan per bottle, and iced black tea costs 2 yuan per bottle. How many bottles of farmer's orchard? How many bottles of black tea did mom buy? List the formula. Don't send the answer directly
Solution: suppose mom bought x bottles of farmer's orchard and (7-x) bottles of iced black tea
4x＋2(7-x)=20
X=3
7-x = 7-3 = 4 (bottle)
A: Mom bought 3 bottles of farmer's orchard and 4 bottles of iced black tea
In the equal ratio sequence {an}, if A3 and A9 are two of the equations 3x ^ 2-11x + 9 = 0, then the value of A6 is ()
a6²=a3a9,a3a9=9/3=3
So A6 = ± root 3
x1=a3; x2=a9
x1*x2=c/a=9/3=a3*a9=(a6)^2
a6=±√3
How many factors are there that can be divided by 15?
1. Three, five, fifteen, four
Five,
1, 3, 5, 15, and itself;
The supermarket has a beverage promotion activity on Sunday. It costs 12 yuan per bottle. If you buy 3 bottles, you can get one free. If you buy 33 bottles at a time, how much is it cheaper per bottle?
Ninety-six
In the equal ratio sequence {an}, if A3 and A9 are two of the equations 3x2-11x + 9 = 0, then the value of A6 is ()
A. 3b. ± 3C. ± 3D
If A3 and A9 are two of the equations 3x2-11x + 9 = 0 in the equal ratio sequence {an}, then A3 · A9 = 3, A6 & nbsp; can be obtained from the relationship between the root of quadratic equation of one variable and the coefficient; then A3 · A9 = A62 = 3 can be obtained from the definition and properties of the equal ratio sequence, and A6 = ± 3 can be obtained from the solution, so C
How many factors of 2130 can be divided by 5
Hello!
2130=2x3x5x71
So there are 5 10 15 30 355 710 1065 2130, a total of 8
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1. The price of 24 bottles of drinks per box is 55 yuan, so the price of each bottle is 55 / 24 yuan. Therefore, the functional relationship between the total price y (yuan) of drinks and the number of bottles x is whether it is a linear function or a positive proportional function
2. If the air temperature on the ground (at an altitude of 0 km) is 20 ℃, and the air temperature drops by 6 ℃ for every 1 km increase, then the relationship between the air temperature x (℃) and the altitude y (km) is whether it is a linear function or a positive proportional function
3. The functional relationship between the area X (cm2) and the side length y (CM) of a square is whether it is a linear function or a positive proportional function
1. Y = 55 / 22x, which is a linear function and a positive proportional function
2. Y = 20-6y, is a linear function, but not a positive proportional function
3. X = y ^ 2, not a linear function, not even a positive proportion function
In the equal ratio sequence {an}, if A3 and A9 are two of the equations 3x2-11x + 9 = 0, then the value of A6 is ()
A. 3b. ± 3C. ± 3D
If A3 and A9 are two of the equations 3x2-11x + 9 = 0 in the equal ratio sequence {an}, then A3 · A9 = 3, A6 & nbsp; can be obtained from the relationship between the root of quadratic equation of one variable and the coefficient; then A3 · A9 = A62 = 3 can be obtained from the definition and properties of the equal ratio sequence, and A6 = ± 3 can be obtained from the solution, so C
There are at least a few factors for numbers divisible by 18
There are six integers: 1, 2, 3, 6, 9 and 18
At least six
1 2 3 6 9 18