Choose two logarithms from 2, 3, 4, 6, 8, 10 and 12, and make their ratio equal to 2 1. Select two logarithms from 2, 3, 4, 6, 8, 10 and 12, make their ratio equal to 2 and form a proportion, and then select two logarithms whose ratio is 3 and form a proportion 2. Can you make a ratio of four sums within 20, all of which are two-thirds?

1、4：2=6：3
6：2=12：4
two
4:6=12:18

The following equation holds: 2 [3 = 8, 4 [2 = 8, 5 [3 = 11, 7 [10 = 27

Find the law, found that: a ☆ B = a + 2B
So 7 [4 = 7 + 2 * 4 = 15

A freight car and a bus went from a and B to each other, met three hours later, and then walked at the original speed for another hour. At this time, the bus walked four times of the whole length
Three thirds, the truck from the full distance of 60 kilometers, ask the length of the whole journey
Thank you very much.

One more hour for a bus is equivalent to four hours for the whole journey. It takes 4 △ 3 / 4 = 16 / 3 hours to complete the whole journey. The speed of a truck is: 1 / 3-3 / 16 = 7 / 48. After four hours for a truck, it takes 4x7 / 48 = 7 / 12 for the whole journey. The remaining 1-7 / 12 is the corresponding share of 60 km, so 60 △ 1-7 / 12 = 60x12 /

Let a = {1, a, B}, B = {a, a 2, AB}, and a = B, find the value of real number a

∵ set a = {1, a, B}, B = {a, A2, AB}, and a = B, ∵ a ≠ 1, then 1 = A2 and B = AB, or 1 = AB and B = A2, if 1 = A2 and B = AB, then a = - 1, B = 0, then a = b = {- 1, 0, 1} satisfies the condition; if 1 = AB and B = A2, then a = b = 1 does not satisfy the condition, to sum up: a = - 1

If the number a is 1.5 times the number B, then the number B is a fraction of the number a

2/3

Joke: what is the sum of 1000 (including 1 and 1000) natural numbers?

1001/2=500.5
500.5*1000=5005

A car from a city to B city, 3 hours drive 108km, with the same speed in 2.4 hours to reach B city, a, B two city distance how many thousand
Answers to proportional knowledge

The distance between city a and city B is x km
108：3=x:(3+2.4)
x=194.4
To adopt the first correct answer yo. Wish progress!

If the degree of the first angle is x and the degree of the first angle is twice that of the second angle, what is the third angle?

The second angle is 1 / 2x
So the third one is 180-x-1 / 2x = 180-3 / 2 * X
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A construction site needs to transport a pile of soil, 150 vehicles per day, which takes 24 days to complete. If it is required to be completed in 20 days, how many vehicles per day?
It must be solved in proportion

Let X be the unknown
150/x=20/24 X=180
180 cars a day
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If 2A plus 3B equals 2005, what is the algebraic formula 2 [3A minus 2B] minus [a minus b] plus [negative a plus 9b]

Replace one with the other, and the result will be 4010