2sinx+（cosx）²
    x^3+10*x^2+25x+15=0
    x＋606.85/x∧2＝106
    5000=(X-25)*400+5000
    4500=(X-25)*400+5000
    2.5%/(x-17.5%)=2/3
    2.5%/x-17.5%=2/3
    x^2-12x+24=0
    -x+(x^2+2x)^(1/2)
    -b+(b^2+2b)^(1/2)
    24y-2y^2=45
    24y*2y^2=45
    x^2-12x+45=0
    x-12x+45=0
    x（12-x）=45
    （30-3x）（24-2x）=480
    -10lg（1-x）=3.6
    X-17.5%=3
    （18-3x）（6-2x）=60
    x²-9x-2=0

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