Mr. Li wrote a series of regular numbers on the blackboard: 1, 2 / 3, 5 / 8, 13 / 21, 34 / 55 In this string, from left to right, the tenth number is（

Mr. Li wrote a series of regular numbers on the blackboard: 1, 2 / 3, 5 / 8, 13 / 21, 34 / 55 In this string, from left to right, the tenth number is（

(1) 1,4,13,40 (), () (2) 55,34,21,13, (), ()

(1) 121, 364 (multiply 3 by the first number and add 1) (2) 8, 5 (the first number minus the next number will get the third number)

Four children buy a 60 yuan boat together. The first child pays half of the other children's total. The second child pays the other children
The third child pays 1 / 3 of the total, and the third child pays 1 / 4 of the total. How many yuan did the fourth child pay?

The money paid by the first child is half of the total money paid by other children, so it's 1 / 3 of the total money
In the same way:
The second child pays 1 / 3 of the total amount paid by other children, which means that it is 1 / 4 of the total amount
The third child pays 1 / 4 of the total money paid by other children, which means 1 / 5 of the total money
The third child pays 60 * (1-1 / 3-1 / 4-1 / 5) = 13 yuan
I hope you can understand, you can understand and agree

Four children buy a 60 yuan boat together. The first child pays half of the total amount paid by other children, the second child pays one third of the total amount paid by other children, and the third child pays one fourth of the total amount paid by other children. How much does the fourth child pay?
No equations

The first child pays half of the total, that is, the first child pays 1 / (2 + 1) = 1 / 3 of the total
The second child paid one-third of the total, one-quarter of the total
The third child paid a quarter of what the others paid, a fifth of the total
therefore
The fourth child paid:
60 × (1-1 / 3-1 / 4-1 / 5) = 60-20-15-12 = 13 (yuan)

Four children buy a 60 yuan toy boat together. The first child pays half of the other children's total,
The second child paid 1 / 3 of the total amount paid by other children, and the third child paid 1 / 4 of the total amount paid by other children. How much did the fourth child pay?

Because the first child pays half of the other three, the first child pays one third of the total
The second child pays 1 / 3 of the other three, so the second child pays 1 / 4 of the total
The third child pays a quarter of the other three, so the third child pays a fifth of the total
60 * (1-1 / 3 -- 1 / 4-1 / 5) = 13 yuan, so the fourth child pays 13 yuan

Four children buy a 60 yuan toy together. The first child pays half of the other children's money. The second child pays half of the total. The second child pays 1 / 3 of the total. The third child pays 1 / 4 of the total, How much did you pay for the fourth child!

60*（1-1/3-1/4-1/5）=13

Three children buy a model plane together. The first child pays half of the total money paid by the other two children. The second child pays for a model plane
Half of the total price, the third child paid 20 yuan. How much is the price of the model plane?

Hello
The first child pays half of the total of the other two children, and the first child pays one-third of the total,
The second child pays 1 / 2 of the total price. The third one pays 1-1 / 3-1 / 2 of the total price
The total price is 20 (1-1 / 3-1 / 2) = 120 yuan
The model plane costs 120 yuan

Fill in 6.25 2.5 1 () 0.16 ()

6.25 2.5 1 (0.4) 0.16 ( 0.064)
The former number divided by 2.5 equals the latter

Find the rule 0.4375, 0.875, 1.75, (), (), 14
One more!
6.25,2.5,1,（ ）,0.16

0.4375,0.875,1.75,3.5,7,14
6.25,2.5,1,0.4,0.16

73.1.75 () () 0.21875

7 3.1.75（0.875）（0.4375）0.21875