x^2-10.5x+21.6=0
    （i-20%）*-38.89=0.02*-58.32
    （x-180)*(1-25%)/1500=(x-500)*(1-25%)/1000
    x^2-5.6x+6.8=0
    x^2-5.6x-6.8=0
    15+40-x=1.5(20+x）
    3.14/(sqrt(1-0.7^2)x)=3
    e^(-3.14*x/(sqrt(1-x^2)))=0.043
    30/x=45/(x+10)
    30/x*(x+10)
    （1+x）^3=0.4234
    ½xlnx
    (1/4-3*x/4)^3=(5*x*x+x)/4
    x-0.13x=160
    x-0.13x=128
    （1+x）^3=-0.4234
    3x+4*5.5=103
    (x-45)*(x-45)+150*150=x*x
    16^x=8x
    X=1607+49.01+0+87.8+50.91+0.056X+248.4

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