erfcx=10^(-5)
    erfcx=10^(-4)
    erfc7
    arccos(-0.7)
    10×468/2016
    -15+6/1.25+10.5/1.25^2+12.3/1.25^3+10.2/1.25^4+12.6/1.25^5
    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%)]

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