1、 1995=228×8+ 17 1

228= 17 1× 1+57

17 1=57×3+0

Maximum common divisor 57

calculate

228 is an even number, and 1995 is not an even number, so there is no need to divide by 2.

1995-228= 1767, 1767-228= 1539, 1539-228= 13 1 1, 13 1 1-228= 1083, 1083-228=855, 855-228=627,627-228=399,399-228= 17 1,228- 17 1=57, 17 1-57= 1 14, 1 14-57=57

Maximum common denominator of inspection results 57

2、 12 155=5280×2+ 1595

5280= 1595×3+495

1595=495×3+ 1 10

495= 1 10×4+55

1 10=55×2+0

Maximum common divisor 55

calculate

12 155 and 5280 are odd and even numbers and need not be divided by 2.

12 155-5280=6875,,6875-5280= 1595,5280- 1595=3685,3685- 1595=2090,2090- 1595=495, 1595-495= 1 100, 1 100-495=605,605-495= 1 10,495- 1 10=385, 385- 1 10=275,275- 1 10= 165, 165- 1 10=55, 1 10-55=55

Maximum common denominator of inspection results 55

In fact, the principles of the two methods are similar. Division is faster, and subtraction has the format of (a, b). As you should know, the process is complicated.

To tell the truth, I didn't learn the subtraction at all when I participated in the Olympic Games. This method is too complicated to use and the effect is not very good. It is good to know the principle.