x*x+((x*x+2*x)/2)^2=((5^(1/2)*(x*x+2*x)*(8-x*x-4*x))/20)^2
    X²-1800x+2160=0
    2/3X-40%=1/6
    X-28%=21.6
    X÷6/25=26/45÷13/25
    2x=1
    （75+60）*x=（50+60）*（x+1/3）
     y*(71/70)=1000
    35842/x=33187*(1+6.5%)
    40x＋19x+x^2=2400
    49.5-x=25.0
    1-(0.9974)^x=0
    (0.9974)^x=0.5
    x^2=6/√5
    x0
    1.8666x - 22=50
    x/1.06-x/1.06*0.12 = 478600
    x/1.06-x/1.06*0.12 = 4881720
    5x-4=2(2x-3)
    x/1.06-x/1.06*0.12 = 4786000

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