14.2813*300000+0.3124*4000000+1.4854*x-130.1784*50000=585802.8
    14281*300+312.4*4000+1485.4*x-130.851*50000=585802.8
    14281*300+312.4*4000+1485.4*x-130.8512*50000=585802.8
    120x+16000-80x=20000
    132/1.2x-100/x=2
    28x^2-27x-36＝0
    28x2-27x-36
    1194.09*x+3084.74*x^2/sqrt（1-x^2）-1194.09*x/sqrt（1-x^2）=928.13
    x^2-624X+129792=0
    2(x+5+4)=250-2x
    2*x^5-x^4+6*x^2-7*x+2=0
    -10lg(1-x)=2.25
    -10lg(1-x)=2
    -10lg(1-x)=1
    -10lg(1-x)=0.5
    -10lg(1-x)=0.25
    25023*1.05^k=51486*1.02^k
    44657*1.03^k=51486*1.02^k
    10log(1-x)=2.2
    1-10log(x)=0.3974

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