16＾4-1
    7x^2-8x-8=0
    7x^2-8x+3=0
    erfc4.08
    (28-2x)*0.5x
    2000+2000(1+5%)^2+2000(1+5%)^3+2000(1+5%)^4+2000(1+5%)^5+2000(1+5%)^6+2000(1+5%)^7+2000(1+5%)^8+2000(1+5%)^9+2000^(1+5%)10
    2000+2000^2+2000^3+2000^4+2000^5+2000^6+2000^7+2000^8+2000^9+2000^10
    tan(π/5)
    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)

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