x-x/1.06*6.72%=4500000
    x-x/1.06*6.72%=79835.53
    √(x+1)=-1
    y=4*11^2+3*11-15
    y=4*10^2+3*10-15
    y=4*7^2+3*7-15
    y=4*9^2+3*9-15
    y=4*5^2+3*5-15
    (220*63-x)*0.95=10570.15
    （220*63-x）*0.95=11169.15
    150-3x＝5×（42－x）
    8%x+（6000－x）×9%＝500
    （x+8）*（x+8）=2x*x
    x*x-16x-64=0
    2x×x-431x+4500=0
    -1/x
    （n-4）（n+3）=3n
    9x²+34x-7=0
    500000*P*(1-5%)-500000*80-3000000=0
    p=20000000/(1-5%)^5

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