Hello, use the rounding method to find the approximate formula, first find 10000 digits, 2. Look back at the next ten thousand digits. If it is less than 4, it will be discarded. If it is greater than or equal to 5, it moves forward by one bit. Look at the picture below: the first question 1, look for 10,000 first, and then look. The next place where you see 10,000 is 4, and if it is less than 4, you will discard it, so it is about 40,000. The second question 1, look for 100,000 first, and then look here. Look at the numbers after 9. If this place is empty, we need to fill it in. We think this figure is about 500,000, and the previous figure is 490,000, which means that there is a striker position here, so the number here should be greater than or equal to 5, so fill in 5-9 here.