表达式4: "f" Subscript, "y" , Baseline left parenthesis, "x" , right parenthesis equals Start sum from "k" equals 1 to "n" , end sum, "h" left parenthesis, StartFraction, "k" Over "n" , EndFraction , "n" sin left parenthesis, StartFraction, "n" minus 2 "k" Over "n" , EndFraction times pi , right parenthesis minus "n" sin left parenthesis, StartFraction, "n" minus 2 "k" plus 2 Over "n" , EndFraction times pi , right parenthesis , StartFraction, "k" minus 1 Over "n" , EndFraction , "x" , right parenthesisfyx=n∑k=1hkn,nsinn−2kn·π−nsinn−2k+2n·π,k−1n,x
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表达式5: "a" equals 0.0 0 0 0 0 1a=0.000001
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表达式6: "l" left parenthesis, "x" , "y" , right parenthesis equals StartRoot, left parenthesis, "f" Subscript, "x" , Baseline left parenthesis, "x" , right parenthesis minus "f" Subscript, "x" , Baseline left parenthesis, "y" , right parenthesis , right parenthesis squared plus left parenthesis, "f" Subscript, "y" , Baseline left parenthesis, "x" , right parenthesis minus "f" Subscript, "y" , Baseline left parenthesis, "y" , right parenthesis , right parenthesis squared , EndRootlx,y=fxx−fxy2+fyx−fyy2
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表达式7: StartFraction, "l" left parenthesis, 0.9 9 0 1 0 0 0 0 9 7 9 9 9 9 9 9 , "x" , right parenthesis plus "l" left parenthesis, 0.9 9 0 8 2 3 0 9 6 1 1 7 2 2 6 , "x" , right parenthesis plus "l" left parenthesis, 0.6 6 0 8 6 3 2 4 6 3 2 0 8 0 6 8 , "x" , right parenthesis Over 3 , EndFractionl0.9901000097999999,x+l0.990823096117226,x+l0.6608632463208068,x3
