Subtraction by abdication, a special mathematical term, can also be called subtraction by borrowing. That is, when two numbers are subtracted and the number of digits to be subtracted is not enough, borrowing the previous digit is equivalent to adding 10 to this digit, and then calculating.
Actually, there is a trick. For example, on the draft paper, calculate: 5+05 of 65438 minus 4 of 24, and the result is 1, and then subtract it from 10 to get 9, which is a unit, while 2 of ten digits is borrowed, and the calculation of ten digits becomes1-kloc-0/,which is. If ten people want to continue to abdicate, repeat. Of course, this can't be written in a formal place.
Subtraction by abdication is a special mathematical term, which can also be called subtraction by borrowing. That is, when two numbers are subtracted and the subtracted unit is not enough, borrowing the previous unit is equivalent to adding 10 to this unit and then calculating.
Subtraction of abdication within 20:11-9 = 2; 1 1-8=3; 1 1-7=4 ; 1 1-6=5 ; 1 1-5=6 ; 1 1-4=7 ; 1 1-3=8; 1 1-2=9; 12-9=3; 12-8=4; 12-7=5; 12-6=6; 12-5=7 ; 12-4=8 ; 12-3=9; 13-9=4; 13-8=5; 13-7=6; 13-6=7; 13-5=8; 13-4=9。