20lgx=13.98
    20lgx=26
    x*x-1.5*x+0.5=0
    100sqrt(1(x/5)^2)/(x*sqrt(1+(x/0.28)^2)*sqrt(1+(x/100)^2))=1
    arctan(x/5)-90-arctan(x/0.28)-arctan(x/100)=-180
    xx-9x+25=7
    （27.4-x）/x=0.132
    （5x-2)/(2x+2)=4/3
    X=X*0.06/1.06+X*0.06*0.11/1.06+X*0.0003+17100+3122.61
    【（220+260+260）*63-x】*0.85+50*63 = 42147
    【（220+260+260）*63-x】*0.85+40*63=42147
    [（260+220+260）*63-x]*0.85+(8+32)*63=42147
    X+0.01X=56000
    2（-3+k）=5
    2（-3+k)=5
    4x-3（19-x)=6x-7（9-x）
    4-3（10-y)=5y
    x^6=1000000
    x^6=10^6
    X+X*0.08=763.2

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