1+x+x
    3.1198=（（18.92*0.76（x+0.1））/（1+0.76（x+0.1））*（（100-18.25-1.35）/100）*（1/(1+0.31*1.35）+（（2（x+0.1））/（1.47*0.101325））
    1.65=(1+0.05^x)/(1+0.001^x)
    2/3=x*0.02^1.3985
    2/3=x*0.01^162.0804
    2/3=x*0.07^0.9862
    66*0.001^x=0.02^x
    66*0.001^x=0.01^x
    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

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