arctan-0.73
    sqrt（2*720*500/200）
    √2*720*500/200
    0*0.5+2*0.3+4*0.2
    10*0.5+11*0.3+12*0.2
    999+1
    （0.01+0.0002）×0.06
    （2449.04+80.00+75.87+109.89）×0.06
    （2449.04+80.00+75.87+109.89）×0.06
    2449.04×[（1+0.0435）^1-1]+（80.00+75.87）×[（1+0.0435）^0.5-1]
    25874541-25874541×((1-1/(1-6.5%)^5.84)/(1-1/(1-6.5%)^49.76))
    1396692/(6.5%-3.5%)×(1-((1+3.5%)^8/(1+6.5%)^8))
    1396692/(6.5%-3.5%)×(1-((1+3.5%)^8/(1+6.5%)^8))
    16.09×12×8417.41
    （1+0.08）*90
    1.2×（302.4/60）2/（2×（3.14×0.32）2）=
    2*（1+2）^2
    2*（1+2）+2*（1+2）*2
    e2+2e+9
    8417.41×1247.95×0.23

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