6679.03×5.90+230.25×26.5+338.07×21.5+63.77×16.36-1.25（33.72×26.77+149.63×24.3+476.05×19.99+246.47×16.78+3859.96×6.83）=
    230.25×17.01+338.07×12.01+1437.87×2.59+63.77×6.87-33.72×17.28-149.63×14.81-476.05×10.5-246.47×7.29-1163.47×2.96=
    sqrt（54727）
    （1.1×18.1+13.1×19.4 -（25.2-11-0.5）×10）×3.20+2×8.7×1.79+(25.2-11-0.5）×10=
    2.7/3
    2.7/2×119.5
    2.564/2×113.481
    2.564/3
    2.564/2×119.5=
    2.964/3×(2×75.003+113.481)/(75.003+113.481)=
    2.964/2×(75.003+113.481)
    3.1/3×(2×75.003+113.481)/(75.003+113.481)
    3.1/2×(75.003+113.481)
    3.1/3×(2×75.003+115.240)/(75.003+115.240)
    3.1/2×(75.003+115.240)
    3.392×10.1×(2.964-0.4)+10×(2.964-0.4)
    0.295×(18.7×3.9+19×5.3+9.4×1.4+10.1×3.1+20)+10×4.5
    0.295×(18.7×3.9+19×5.3+9.4×1.4+20)+10×1.4
    10^-0.2578
    3.392×2.7×10.1+10×2.7

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