bar(x,y,’m'),axis([0,1,0,1]) ans=0.6766 0.10.2030.40.5060.70.80.91 100 =0:1/n:1 sum((1/n)*(1-x.2) bar(x,y,’m) 0.6717 0.1 0.2030. 0.50.60.7 S(10)=0.7150 S(50)= 0.6766; S(100)=0.6717 由此可知,分割越细,越接近面积准确值0666bar(x,y,'m'), axis([0,1,0,1]) ans =0.6766 clf, n=100; x=0:1/n:1; y=1-x.^2; y1='1-x.^2'; sum((1/n)*(1-x.^2)) bar(x,y,'m') ans = 0.6717 S(10)= 0.7150; S(50)= 0.6766; S(100)=0.6717 由此可知，分割越细，越接近面积准确值