cos(x)*cos(2*x)=0.5
    56Q-(580+40Q)-(56Q*13%-5Q)*12%=0
    56Q-(580+40Q)-(56Q*13%-5)*12%=0
    sinx-cosx
    3.5x（（3.5x/(3.5+2x)）^(1/6))（1/0.015）(（3.5x/3.5+2x)0.113）^(1/2)=62.07
    Y=100+0.9Y+50
    x*ln(x)=-2*0.08528/e
    x*ln(x)=2*0.08528/e
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.520
    x*ln(x)=e/2/0.08528
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=92.53
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=91.281
    x/72+(x-x/1.35)*1.35/72+{(x-x/1.35)+[（x-x/1.35）*1.35-(x-x/1.35)*1.35/1.35]}*1.4/36=50
    x/72+(x-x/1.35)*1.35/72+{(x-x/1/35)+[（x-x/1.35）*1.35-(x-x/1.35)*1.35/1.35]}*1.4/36=50
    12=(44+X)/24+x*0.4/18
    12=(44+X)/24+(X-X/1.4)*1.4/18
    12=（44+x）/24+(x*0.4)/18
    ln（1+x^2）
    12=(44+X)/24+(X-X/1.4)*1.4/18
    12=(44 X)/24+(X-X/1.4)*1.4/18

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