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
    4*27.51
    （0.47*2）+2.34
    0.5/64
    2.5/64
    6*4/3
    0.44+1.07+9.38
    0.5/68
    0.5/28
    36.79*14.02+109.31*11.86+16.28*9.3+164.03*7.29+441.61*2.94+23.96*0.13-119.26*13.26-188.36*9.26-791.27*2.35-36.9*0.13

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