-1*0.3+1*0.4+2*0.2
    -1*0.3+3*0.4+8*0.2
    arctan100/29
    [(1+8%/12)^48(1-5%/4）^8（1+6%)^2]*1000
    250*[1+18%/12]^3*[1+20%/4]^3
    250*[1+18%/12]^3
    (1+0.18/12)^3*250
    39.96×1.17+2×9×√1.17
    49.76+6.27×4.4
    49.76+6.27×12.4
    24.88+7.54×3.3
    67.45×0.87+2×10.5×√1.15
    39.96×0.87+2×10.5×√1.15
    39.96×0.854+2×9×√1.17
    0+2×9×√1.17
    99.59×1.15+2×10.5×√1.15
    32.5+6.27×10.7
    112.4×0.87-2×10.5×√0.87
    18.10+6.27×15.04
    70*4.5

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