One-in-one method means that when the divisor is kept as an integer, no matter what the decimal number is,
Always enter 1 in the integer part.
Truncation means that when the divisor remains an integer, no matter what the decimal places are,
The way to remove them all.
? In the concrete problem of approximate value, rounding method is generally used.
However, sometimes it is necessary to flexibly use the tail-removing method or one method according to the different situations of specific problems.