Fill in the numbers 0-9 to () + () = (), () - () = (), () × () = () respectively, which can't be repeated

Fill in the numbers 0-9 to () + () = (), () - () = (), () × () = () respectively, which can't be repeated

（4）+（5）=（9）,（8）—（7）=（1）,（2）×（3）=（6）

In natural numbers from 0 to 100, the number of times the numerator 2 appears is
In natural numbers from 0 to 100, the number of times the numerator 2 appears is

2 12
20---29
32 42 52 62 72 82 92
19 times

What's the name of a black rectangular element with only pure numbers on the circuit board? The black part is about 0.4cm long, with only a few pieces on it, such as 240, etc
There are four side-by-side connections between the two circuit wires (just like household lamps, they are connected in parallel), and the numbers are not the same
One of the two circuit lines is led out by one of the magnetic induction coils. The other circuit line is connected with two resistors on the right side of the front of the triode (model jcs8n60c). It feels like a resistor. What's the potential of this resistor? If it's something else, please tell me the unit

In general, it should be resistance, the unit is Ohm. Resistance value discrimination: the first two digits of the three digit number are significant numbers, and the last one is the nth power of 10. The relationship between the first two digits and the last one is multiplication, for example: 240 = 24 × 10, the 0th power = 24 × 1 = 24 ohm
If it is 241, then 241 = 24 × 10 to the first power = 24 × 10 = 240 Ω, and so on

What does the number 1 stand for

Represents a thing or quantity

1: When using numbers to represent numbers, arrange () in a certain order. The position they occupy is called ()
2: The sum of subtraction and difference is 150, and the sum of subtracted, subtracted and difference is ()

2: The sum of subtraction and difference is 150, and the sum of subtracted, subtracted and difference is (300)

Xiao Li got four cards of the same size and texture, which were marked with numbers 1, 2, 3 and 4 respectively. He buttoned the side marked with numbers down on the table, randomly selected one of them (not put back), and then randomly selected the second one from the remaining three cards on the table. (1) using the method of drawing a tree diagram, list all the possible situations of the numbers marked on the cards Xiao Li picked these two times (2) calculate the probability that the product of the numbers on the two cards drawn by Xiao Li is odd?

(1) As shown in the figure: (2) from (1), there are 12 kinds of products, and there are 2 kinds of odd products. Probability p (odd product) = 16

Mathematics A & # 178; - 6ab + 9 + | 2a-b | = 0, find a of B

∵a²-6ab+9+|2a-b|=0
∴（a-3)²+|2a-b|=0
∴a-3=0 2a-b=0
∴a=3 b=6
∴a/b=3/6=1/2,
Remember, the sum of squares is absolute, but numbers greater than or equal to 0 are OK

-7,0,1,2,9,（）
A12 B18 C24 D28

Add 1 to the cube of an integer, so add 1 to the cube of 3, that is 28

Simple calculation of 7 * 0.7/9

2.7*0.7/9=2.7/9*0.7=0.3*0.7=0.21

b. C is greater than 0 if 8 * 9 / a = 3 * 5 / b
Given that ABC is greater than 0, if 8 * 9 / a = 3 * 5 / b = C / 1, then ABC should be in the order from small to large

Let 8 * 9 / a = 1
3*5/b=1
c/1=1
So a = 72
b=15
c=1
So a > b > C