25a^2-180a+324
    25a=3
    x*0.51*3.03*1.85=1.86
    x*0.51*3.03=1.86
    （8456+19.5+50+X）*3.5%=4X
    x+4/x
    （8456+19.5+50+X）*0.3%=4X
    1.4232=-0.0266x^2+0.0893x+1.3599
    1.4203=-0.0266x^2+0.0893x+1.3599
    5X^6-261029X+261024=0
    （8456+19.5+50+X）*3.2%=4X
    0.10*x+(x*1.05+200)+0.15*x+(0.10*x*0.1655)=5425.6
    （8456+19.5+50+X）*3.5%=4X
    0.10*x+(x*1.05+200)+0.10*x+(0.10*x*0.1658)=5425.6
    0.10*x+(x*1.05+200)+0.15*x+(0.10*x*0.1658)=5425.6
    0.10*x+(x*1.05+200)+0.15*x+(0.10*x*0.1655)=4.05
    x*0.01+x=9322
    x^4+6x^2+8=0
    100-5*（20-x）=70
    4x+10(x+1)=190

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