【（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
    X+X*0.08=0.2544
    25+x＝32.827+149.692-x
    25x×25x-11+50x=0
    250*sqrt(1+(0.33x)^2)*sqrt(1+(0.68x)^2)/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.01x)^2)*sqrt(1+(1.75x)^2)*sqrt(1+(0.17x)^2))=1
    -20lgx-10lg4 = 20lg(250/(30*sqrt10))
    -20lgx-20lg4=20lg(250/(30*sqrt10))
    250*sqrt(1+(0.33x)^2)*sqrt(1+(0.68x)^2)/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.01x)^2)*sqrt(1+(0.42x)^2)*sqrt(1+(0.17x)^2))=1
    250/(30*sqrt(1+(0.1*30)^2)*sqrt(1+(0.01*30)^2))=4/x
    250/(x*sqrt(1+(0.1+x)^2)*sqrt(1+(0.01x)^2))=1

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