未命名图表 | Desmos

表达式33: "Y" equals left bracket, "y" Subscript, 1 , Baseline , "y" Subscript, 2 , Baseline , "y" Subscript, 3 , Baseline , "y" Subscript, 4 , Baseline , "y" Subscript, 5 , Baseline , "y" Subscript, 6 , Baseline , "y" Subscript, 7 , Baseline , "y" Subscript, 8 , Baseline , "y" Subscript, 9 , Baseline , "y" Subscript, 10 , Baseline , right bracket

equals

0.4

15.4

27.6

30.8

30.9

27.8

22.4

15.2

0.4

表达式34: "n" equals 10

表达式35: 1 half left parenthesis, "Y" left bracket, "n" , right bracket plus "Y" left bracket, 1 , right bracket , right parenthesis plus 1 half Start sum from "k" equals 1 to "n" minus 1, end sum, StartFraction, "Y" left bracket, "k" plus 1 , right bracket minus "Y" left bracket, "k" , right bracket Over "X" left bracket, "k" plus 1 , right bracket minus "X" left bracket, "k" , right bracket , EndFraction left parenthesis, StartAbsoluteValue, "x" minus "X" left bracket, "k" , right bracket , EndAbsoluteValue minus StartAbsoluteValue, "x" minus "X" left bracket, "k" plus 1 , right bracket , EndAbsoluteValue , right parenthesis left brace, "X" left bracket, 1 , right bracket less than or equal to "x" less than or equal to "X" left bracket, "n" , right bracket , right brace

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