x/3-x/2+0.5=1
    3825x∧2－570x－551=0
    h=(0.014*1922.8/0.025^0.5)^0.6*(9+2h)^0.4/9
    h=221.4222/(0.95*（19.6*（153.5158-h））^0.5)
    1.2*30%+0.9*20%+x*50%=1
    30+x*50%=1
    (20%*10+75%*y)/(10+y)=25%
    (20%*10+75%*x)/(10+x)=25%
    20%*10+75%*x/10+x=25%
    0.1*0.165*0.33+0.5*0.115*0.23+0.4*(−0.185)*(−0.37)=x
    x+e^x=0
    x^4-3*x^3+3*x+1=0
    188*x*x+640*x+840=0
    (4.8-x)* (4.8-x) +1.4*1.4=x*x
    (4.8-x)^2+1.4*1.4=x*x
    （1+r/12）^12-1
    （360/x）×（14/15）=420/（x+3）
    9/4-477/5+x=0.54
    x/1.13*0.1+x=21
    17x^2-16x+2＝0

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