(2x-1)^(1/3)+(x+1)^(1/3)+3x+4=0
    11.5=10lg（r/5）+0.3×（r-5）
    x/1.06-（x/1.06-x/1.06*0.06*0.12）*0.05=30
    sin(x)+0.1*cos(x)=0.2
    sin(x)+0.1*cos(x)=0.4
    sin(x)+0.1*cos(x)=0.5
    sin(x)+0.1*cos(x)=0.7
    sin(x)+0.3*cos(x)=1.2
    sin(x)+0.3*cos(x)=0.091
    sin(x)+0.2*cos(x)=0.091
    sin(x)+0.1*cos(x)=0.091
    sinx=0.5
    sinx+0.1*cosx=0.0914
    sinx+0.1*cosx=0.0914
    sinx+0.1*cosx=0.00711
    sin2a+0.4π-2a=0
    sin2a+1.256-2a=0
    x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)-{x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)}*0.16=13500
    0.4x+x*x=0.00408-0.0102x
    arctan(0.1x)+arctan(0.2x)+arctan(49x)-arctan(4.07x)=0.5π

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