4.385*exp(-1/x)=(3.14*x)^(1/2)
    3x²-5x+1＝0
    sinx=0.95x
    1/x＾2
    1/x2
    5(x+3)=2(4x-13)
    X^2-8x+13
    X^2-6x+12
    120*8÷（120-100）*100=x
    2/3x^2＋5/2x-1
    120*8÷（120-100）=x
    x=1+5
    0.101*(1-exp(-1.1*0.294))*44.6*1000*0.294^2 = x
    0.101*(1-exp(-1.1*0.22))*44.6*1000*0.22^2 = x
    0.101*(1-exp(-1.1*0.18))*44.6*1000*0.18^2 = x
    πcosx+2sinx=2
    πcosx+2sinx=2
    x^3-11x-6=0
    2(2x+76)=3(95-5x)
    2.7×(0.0000189^0.313)×(1.149^0.687)×(0.0009)^0.687×(x^1.687)+18×0.0000189×x-(1600-1.149)×9.81×(0.0009^2)=0

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