333*888/999
    （1500*460-240*1200）/300
    （1400*460-300*1200）/200
    （1500*300-240*1400）/100
    （550+11）×[（1+0.0435）^1-1]
    550×0.02=
    750*935-695*500
    0.9489-0.9786
    0.0183+0.0916+0.2381
    0.9^5
    0.9^3*0.1
    0.2+0.8*0.15+0.8*0.85*0.1
    0.2+0.8*0.15*0.8*0.85*0.1
    0.8/0.94
    0.5^0.2
    lg0.2/lg0.5
    lg2/lg5
    lg5/lg2
    153846.15+76923.08
    153846.15+80645.16

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