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ÓÃ$g(x)=A*x^2+B*x+C$À´´úÌæÔ­º¯Êý$f(x)$£¬Éè$g(x)$Ô­º¯ÊýΪ$G(x)$£¬ÏÔÈ»$G(x)=\frac{1}{3}*A*x^3+\frac{1}{2}*B*x^2+C*x$ $\int_a^b f(x) dx \approx \int_a^b g(x) dx=G(b)-G(a