First, let me write:
1, the mantissa of a number with "ten thousand" omitted. The approximate value of this number is 65438+ million, which is (), and the minimum value is ();
2.6 1 1000, 609900, 620000 and 609000, of which () is the closest to 6 10000?
3, 789889 < 7 □ 9898, □ Fill in ().
Second, I will line up:
First, rewrite the following numbers into "ten thousand" numbers, and then arrange these numbers in order from small to large.
5700000、7050000、75000000、50070000
Third, let me solve the problem:
1, use the number card 0, 1, 2, 3, 4, 5, 6 to discharge the seven digits of one and the smallest seven digits. How much is the seven digits of one greater than the smallest seven digits?
2. Write a number with10,000 digits and each digit. The tenth, hundredth and thousandth digits are destiny. How many such seven digits are there?
There are six number plates on the desktop, three of which are 9 and the other three are 0, so you can use them to discharge a lot of six digits. Among these six numbers, in descending order, what is the fifth number? (No.6 card can be regarded as 9, and No.9 card can also be regarded as 6. )