The first question, there is a 0 on the left and right sides, and removing a 0 at the same time is 45÷ 1000. In the vertical calculation of normal column division, 45 does not have 1000, so write 0 on 5 of 45, and then add a decimal point next to 45, indicating that 45.0,450 does not have 1000. At this time, write a 0 on the first 0 above 45.0, and then follow 45.0, which is 450. At this time, there are four 1000 in 4500, just above 45.00. Write 4 on the second 0 and continue to decrease. 4500-4000 equals 500, and there is no 1000 in 500, so add a zero after 500, and then 500 becomes 5000, and there are five 654300. So is the second one.