发布网友 发布时间:2022-04-23 02:41
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热心网友 时间:2023-06-07 06:35
灞曞紑鍏ㄩ儴鈭?-鈭?+鈭? f(x) dx=鈭玔0,1] (a+bx^2)dx= ax+1/3*bx^3 | [0,1]=a+b/3=1 锛?----------锛?锛?br />E(x)=鈭玔0,1](ax+bx^3)dx=1/2*ax^2+1/4*bx^4 | [0,1]=a/2+b/4=0.6锛?---------锛?锛?br />瑙e緱 a=0.6锛宐=1.2锛?br />D(x)=E(x^2)-(E(x))^2=鈭玔0,1](ax^2+bx^4)dx-0.6^2=1/3*ax^3+1/5*bx^5 | [0,1]-0.6^2