Question

How to prove 19-1=20​

Answer 1

Answer:

1

Step-by-step explanation:

19=XIX

19-1=XIX-I

=XX

=20

SO,19-1=20

Answer 2

Answer:

Step-by-step explanation:

19=19

19-0=19+0

19-(1-1)=19+(1-1)

19-1-1=19+1-1      add 1 to both sides

19-1=19+1

19-1=20