Take the calculation of the root number of 8 1572460 as an example. The root number of every two digits corresponds to the result of 1, so it should be separated every two digits, that is, 8 1, 57, 24, 60.
First calculate the root number of 8 1, which is obviously 9. Let's just fill in 9 minus 8 1.
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The next step is very important. We're not looking for one. & lt57, but 2× 10ka+a? Maximum a of & lt57 (k is the number written before a, here it is 9). This is because when this A is added to the result, the square of the result increases by 20ka+a? .
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The next step is the same, except that k becomes 90.
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And so on, you can get the final result.
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Actually, there is a remainder. If there is a remainder, you can add two zeros at a time and continue the calculation after the decimal point. I won't count them here.
You don't need to calculate the root number manually anywhere. If you often need to open the root sign, it is recommended to use a calculator.