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
    (40000+4400*5.6502)/ 5.6502
    (40000+440085.6502)/ 5.6502
    20000+5600*4.1114-5000*0.5066
    1.1*[1+(2500/8900)*(1-25%)]
    3%+1.1*(11%-3%)
    14.1%+(14.1%-6%)*(2/3)
    5%+1.3*(12%-5%)
    8+√（1/100）-（-8）*0.4

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