2∧0.1
    log(0.1,2)
    x-300=0.3x
    log2（2^30-1+2）=
    log2（2^30-1+2）
    1.1*[1+(2500/5900)*(1-25%)]
    444034.56-500000
    102000/(1+14%)+102000/(1+14%)^2+102000/(1+14%)^3+350000/(1+14%)^4
    618857.30-500000
    162000/(1+14%)+162000/(1+14%)^2+162000/(1+14%)^3+410000/(1+14%)^4
    162000+108000+140000
    80000-35%*(80000-160000)
    80000+52000+30000
    (160000-80000)*(1-35%)
    4x－（6+x）＝18
    2250000000-1105000000+2520000000
    21000*120000
    1300*850000
    5000*450000
    (10000+5600*4.1114-1000*0.5066)/4.1114

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