0.616438-1
    (0.01+0.07*0.1*0.5)/(0.07^2+0.1^2+2*0.07*0.1*0.5）
    sqrt(0.5^2*(0.07^2+0.1^2)-2*0.07*0.1*0.5^2*0.5)
    0.5^2*(0.07^2+0.1^2)-2*0.07*0.1*0.5^2*0.5
    0.5^2*3%^2+0.5^2*5%^2+2*0.5*0.5*7%*10%*(-0.5)
    (0.000475)^1/2
    0.5^2*3%^2+0.5^2*5%^2+2*0.5*0.5*3%*5%*(-0.5)
    5.9×942-6.1×920
    1/16
    5300*12/8709
    ( 10 × 6 + 10 × 6 + 6 × 6 + 4 × 6 + 3 × 6 )× 2 - 4 × 3 × 2
     9.8 × 9.8 × 6 + 1 × 1 × 4 + 2 × 2 × 4 + 3 × 3 × 4
    4*-1/2
    5 × 5 × 5 + 10 × 10 × 10 + 10 × 10 × 16
    5×5×4 + 10×10 × 4 +(10×16 + 10×10 + 10×16)×2
    （12 × 9 + 12 × 6 + 9 × 6）× 2
    4 × 4 × 4 + 6 × 6 × 4
    (4 × 4 + 4 × 6 + 4 × 4 + 4 × 6 + 6 × 6)× 2
    80000*(1.03)^22 =
    80000*(1.03)^21 =

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