0.12X=0 (X*0.4)*0.92+4000=X*0.55
    0.12X=0 0.12X=12
    0.12X=0 0.12X=-12
    0.12X=0 0.12X=0
    200×0.6x+100×0.3x+100×（-0.3x）=15000
    X-X÷1.03×0.03- X÷1.03×0.03×0.07×50%- (X÷1.03×80%×30%-2000)=30000
    169*0.82*0.82*1/5*1*17+169*0.82*0.82*4/5*1/5*2*17+169*0.82*0.82*（1-1/5-4/5*1/5）*3*17
    169*0.82*0.82*36+169*0.82*0.17*108
    169*0.82*1/5*1*6+169*0.82*4/5*1/5*2*6+169*0.82*(1-1/5-4/5*1/5)*3*6+1014
    169*0.82*1/5*6*2+169*0.82*4/5*1/5*6*3+169*0.82*（1-1/5-4/5*1/5）*6*4
    0.15*20X+0.85*44x=19631*0.53
    0.15*20X+0.85*44x=14338*0.53
    2/17
    8.5
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