66*0.001^x=0.07^x
    5.8=6.31*cos(x)-1.7*cos(x)*sin(x)
    6.2=6.68*cos(x)-1.7*cos(x)*sin(x)
    6.6=7.1*cos(x)-1.7*cos(x)*sin(x)
    2/3=x*0.05^1.070969
    2/3=x*0.05^0.674162
    66*0.0001^x=0.05^x
    2a=8
    3x*0.05^1.070969=2
    5X+4X=45
    66*0.001^x=0.05^x
    15*504+8y=40000
    66×0.001^x=0.05^x
    x+(x+31)=311
    0.618×（180-n）＝n
    x/（x^2+1）
    lnx＋x＝2e
    e^x-1
    6+x=(x^4+30-12x^2)^2
    0.34*x=4175

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