-50000*0.2+40000*0.35
    1*(20/30)+5*(4/30)+10*(3/30)+20*(2/30)+100*(1/30)
    230*0.3+240*0.2+250*0.15+260*0.15+27+280*0.05+290*0.05
    (165000/1.12+165000/1.12^2)/225000
    (165000/1.2+165000/1.2^2)/225000
    1/1.726776
    1.264/0.732
    2-0.736*2
    1-5.018+1.838
    1.838*2-2
    1.82+0.018
    6.036-1.018
    2-0.036-0.144
    0.018*8
    e^(-4)
    -1.1-1
    105×13
    6656+5504
    128×52
    128×43

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