6,24,60,120,（） .A.186 B.200 C.210 D .220

Choose C,
6=1*2*3
24=2*3*4
60=3*4*5
120=4*5*6
=5*6*7
Answer? = 210

What is the formula rule of 12 * 42 = 24 * 21

(a*10+2a)*(4a*10+2a)=504*a^2；
(2a*10+4a)*(2a*10+a)=504*a^2
A ^ 2 means the square of A

12 * 42 = 24 * 21 13 * 62 = 26 * 31 14 * 82 = 28 * 41 46
Observe the formula and find the law
1242=2421
1362= 2631
1482 =2841
4696 =6964
1、 What's the rule you found?
2、 Can you write a few more such expressions?

1.12*42=24*21
Let's look at the digits of four numbers, 2 * 2 = 4 * 1 = 4
Let's look at the tens of four numbers 1 * 4 = 2 * 2 = 4 (other formulas are omitted)
2. According to the multiplication table, 2 * 2 = 1 * 4, 2 * 3 = 1 * 6, 3 * 3 = 1 * 9, 2 * 4 = 1 * 8, 2 * 6 = 3 * 4, 3 * 6 = 2 * 9, 4 * 6 = 3 * 8, 4 * 9 = 6 * 6

When a decimal is regarded as an integer, the number is 607 larger than the original number?

The original number is X:
10x=607.5+x
x=607.5÷9=67.5

Primary school mathematics grade 5 Volume 1 synchronous exercise answers

A topic in the second grade of junior high school
The distance between port a and port B is 60 km. A ship sails downstream from port a to port B. after a period of time, it turns back and sails against the current for 10 km. Then it turns around and sails to port B. the time spent in this way is the same as that of the ship directly sailing from port B to Port A. if the current speed is 2 km / h, the speed of the ship in still water can be calculated

If the speed of the ship in still water is x km / h, then the speed in upstream water is (X-2) km / h, and the speed in downstream water is (x + 2) km / h. therefore, the time from B to a is 60 / (X-2), and the time from a to B is (60 + 10) / (x + 2) + 10 / (X-2) (60 + 10 is due to walking 10 meters upstream and 10 meters downstream), The result is: 60 / (X-2) = (60 + 10) / (x + 2) + 10 / (X-2)
The solution is x = 12 km / h

English translation
A customer gave me an email that I didn't understand very well. My level was too low. I asked for help from a high-level Spanish translator. Don't use software to translate it to me automatically
Original text:
LOS PRECIOS SON ELEVADOS.NO PUEDO COMPRAR A ESOS PRECIOS.LUEGO HAY QUE
PAGAR IMPUESTOS Y TRANSPORTE EN EUROPA ESTOY COMPRANDO UN NEUMATICO
CHINO POR EJEMPLO 38,6$ 1956015 88V PUESTO EN MI NAVE .
NO PUEDO PAGAR 31.8$ MAS TRANSPORTE ,ARANCELES,SEGURO MARITIMO Y QUE ME SALGA IGUAL,SI COMPRO ES PARA QUE GANE DINERO.：

The price is too high. I really can't buy it at these prices (see? The key is that the price is too high. He said I can't buy it) ELEVADOS.NO Puedo compar a ESOS precios. And then I have to pay taxes and ship it to Europe

English translation
Please translate the following into Spanish:
Excuse me!
Yes?
Is this your handbag?
Excuse me, please say it again?
Is this your handbag?
Yes, it is
Thank you very much!

Excuse me! Excuse me! What's the matter? Is this your handbag? Yes, it's mine. S í, lo es.Muchas gracias....

English translation
1 mechanical equipment 2, transport terminal 3, page 4, date 5, packing list 6, Engineering Co., Ltd. 7, total number of pieces 8, compilation 9, manufacturer 10, audit 11, equipment name 12, packing number

1. Equipos MEC á Nicos, 2. Embarcadero de transporte; 3. P á ginas; 4. La Fecha; 5. El listado de embarque, 6. Sociedad Limitada an'onima de Las Ingenier í as. 7. El n ú mero total, 8. Plantilla (noun) / planar (verb)

11,22,33,44,55,66,77,88,99 number of English words

Eleven
twenty two
thirty three
forty four
fifty five
sixty six
seventy seven
eighty eight
ninety nine

6,24,60,120,（ ） .A.186 B.200 C.210 D .220