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
    32^2=25000*x
    3.14/(sqrt(1-(0.28)^2)x)=0.1
    e^(-3.14*x/(sqrt(1-x^2)))=0.4
    x^2-7.8x+6.8=0
    x+0.316019x=3999
    X=1607+49.01+100+87.8+52.48+0.056X+263.4
    39/(39-x)/0.9=2.1
    39/(39-x)/0.9=1.7
    139/(139-x)/0.9=1.5
    139/(139-x)/0.9=1.3
    139/(139-x)=1.3

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