WFU
【怎樣解題 #1】2018 指考數甲|單選4
Remove["Global`*"];
f[x_] = -x^2 + 499;
Plot[ f[x], {x, 0, 10} ]
A = Integrate[ f[x], {x, 0, 10} ]
B = Sum[ f[n], {n, 0, 9} ]
C = Sum[ f[n], {n, 1, 10} ]
D = Sum[ ( f[n] + f[n + 1])/2, {n, 0, 9} ]
B < C
B < A
C < D
A < D
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