sqrt(0.2*(0.5-0.175)^2+0.3*(0.25-0.18)^2+0.3*(0.15-0.18)^2+0.2*((-0.2)-0.18)^2)=
    sqrt(0.2*(0.5-0.175)^2+0.3*(0.25-0.18)^2+0.3*(0.15-10.18)^2+0.2*((-0.2)-0.18)^2)=
    （1/0.03）
    -10/3
    10 /3
    0.2*0.5+0.3*0.25+0.3*0.15+0.2*-0.2=
    （17.5%-5%）/0.051245=
    11/9
    sqrt（0.2*（0.1-0.175）^2+0.3*（0.15-0.175）^2+0.3*（0.2-0.175）^2+0.2*（0.25-0.175）^2）=
    sqrt（0.2*（0.1-0.175）^2+0.3*（0.15-0.175）^2+0.3*（0.2-10.175）^2+0.2*（0.25-0.175）^2）=
    sqrt（20%*（10%-17.5%）^2+30%*（15%-17.5%）^2+30*（20%-17.5%）^2+20%*（25%-17.5%）^2）=
    tanπ/2
    tan2/π
    cos3
    654-466
    654*466
    654+456
    271+31
    √200
    3.63*1.1=

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