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    0.5*(-5%)%+0.5*15%
    0.5*25%+0.5*5%
    1/3【(25%-15%)^2+(15%-15%)^2+(5%-15%)^2】
    1/3【(40%-16.67%)^2+(20%-16.67%)^2+(-10%-16.67%)^2】
    1/3【0.1^2+0.1^2】
    1/3(40%+20%-10%)
    1/3(25%+15%+5%)
    sin97
    2√3-2
    √3-2
    -1%/(10%*10%)=
    1.67%/(√(0.67%)*√(4.2%))
    -1%/10%*10%=
    arctan-0 048
    [15%^2+(-5%)^2]/2-5%^2=
    [5%^2+25%^2]/2-15%^2=
    -0.25%-15%*5%=
    [5%*15%+25%*(-5%)]/2=
    1.67%/√(0.67%)*√(4.2%)
    4.17%-15%*16.67%

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