式6: StartFraction, "f" left parenthesis, 100 , right parenthesis minus "f" left parenthesis, 98 , right parenthesis Over 100 minus 98 , EndFractionf100−f98100−98
equals=
861482.9 9 3 5 1 2861482.993512
6
式7: StartFraction, "f" left parenthesis, 100 , right parenthesis minus "f" left parenthesis, 99 , right parenthesis Over 100 minus 99 , EndFractionf100−f99100−99
equals=
871940.9 0 2 6 7 7871940.902677
7
Can more easily approximate instantaneous velocity by using a slider or variable like this:
8
式9: StartFraction, "f" left parenthesis, 100 plus "h" , right parenthesis minus "f" left parenthesis, 100 , right parenthesis Over "h" , EndFractionf100+h−f100h
equals=
904349.0 5 1 8 8 7904349.051887
9
Let h get really close to 0 to see better and better estimates of the instantaneous rate of change in the year 2000.