0.2*（0.3-0.19）*2.5*3
    0.2*（0.3-0.19）*1.2*6
    0.2*（0.5-0.19）*1.8*3
    0.2*（0.5-0.19）*1.8*3
    0.2*（0.5-0.19）*1.8*2
    0.2*（0.3-0.19）*3.6*3
    0.2*（0.3-0.19）*（3.6+1.2）*2
    0.2*（0.3-0.19）*3.6*2
    0.25*（0.5-0.19）*1.6*3
    0.25*（0.5-0.19）*2.35*3
    0.25*（0.5-0.19）*（3.25+3.35）*3
    (19.4×1.71+19.7×4.99+19.8×3.3+23.2×5.8+25.7×3.41)/(1.71+4.99+3.3+5.8+3.41)
    106.76+152.77+213.23+540.41+1680.4-1274.26
    (6558.71×4.88)/(1274.26×7.95)
    2/3×1.0×14.3×500^2×3.14×500×0.67/π×10^(-6)+360×35185×415×0.59×10^(-6)=
     2/3×1.0×14.3×500^2×3.14×500×0.67/π
     2/3×0.34×14.3×1000×500×0.67/π
    sin(3.14×0.57)
    sin(0.34×3.14)
    1+0.75×0.66-√(〖(1+0.75×0.66)〗^2-0.5-0.625×0.66)

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