90.628+393.235+483.047+458.422+20.743+2459.289
    2×48×√1.664
    1.664×(10.7×0.9+11.4×8.4)+10×9.3
    0.601×(18.7×3.9+19×5.3+9.4×1.4+10.1×3.1+10.7×6.2+11.4×8.4+20)+10×19.1
    8.4/3×(2×179.457+286.248)/(179.457+286.248)
    8.4/2×(179.457+286.248)
    8.4/3×(2×49.485+536.06)/(49.485+536.06)
    8.4/2×(49.485+536.06)
    8.4/3×(2×179.457+286.24)/(179.457+286.24)
    8.4/2×(179.457+286.24)
    140.556+300.844+136.212+294.877+908.486
    90.628+393.235+483.047+458.422+20.743
    9/0.4
    0.4/9
    （8/27）+（1/9）
    60÷4-6-4
    1.051228540112500*1.063927+0.392114402158158
    20.004 / (1.834+1.5)
    2020^2-2019^2
     3.28+0+1.5+1.834+10.89+0+1.5+1

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