5x/(x+1200)=2.42
    x-0.8-0.2*sinx=0
    x-0.8-0.2*cosx=0
    x-0.2*cosx-0.8=0
    x-cosx=0
    x*x*x+3*x*x-1=0
    （1.2x+360）-x=600
    300000=5831*（1-（1+x）^-60）/x
    (420*x)*0.005
    110+(n-9)(n-10)=22(n-9)
    n^2-41n+398=0
    110+(n-9)*(n-10)=11(n-9)
    n^2-30n+299=0
    x²-16x-64=0
    x2-16x-64=0
    2x=4+4x
    x-0.7x=3.6
    x+0.1=22
    x+10%=22
    x(x+1)=50

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