表达式3: "J" left parenthesis, "x" , right parenthesis equals Start sum from "i" equals 0 to 2, end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, "i" , Baseline "x" Superscript, 2 "i" , Baseline Over 2 Superscript, 2 "i" , Baseline left parenthesis, "i" ! , right parenthesis squared , EndFractionJx=2∑i=0−1ix2i22ii!2
3
表达式4: "J" left parenthesis, "x" , right parenthesis equals Start sum from "i" equals 0 to 3, end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, "i" , Baseline "x" Superscript, 2 "i" , Baseline Over 2 Superscript, 2 "i" , Baseline left parenthesis, "i" ! , right parenthesis squared , EndFractionJx=3∑i=0−1ix2i22ii!2
4
表达式5: "J" left parenthesis, "x" , right parenthesis equals Start sum from "i" equals 0 to 4, end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, "i" , Baseline "x" Superscript, 2 "i" , Baseline Over 2 Superscript, 2 "i" , Baseline left parenthesis, "i" ! , right parenthesis squared , EndFractionJx=4∑i=0−1ix2i22ii!2
5
表达式6: "J" left parenthesis, "x" , right parenthesis equals Start sum from "i" equals 0 to 100, end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, "i" , Baseline "x" Superscript, 2 "i" , Baseline Over 2 Superscript, 2 "i" , Baseline left parenthesis, "i" ! , right parenthesis squared , EndFractionJx=100∑i=0−1ix2i22ii!2
