-4082750+W-W*10%/4= 300000
     -4082750+3000000+W-W*10%/4-450000 = 300000
    e^x-x²=0
    asdasdasddsa123123
    asdasdasddsa
    1/x+1/（x+2）+1/（x+3）=1/（x+5）
    x=150-(2491.27-2.30285*x)*((0.622*(2*e^(18.5916-3991.11/(x+233.84))/15)/(100-(2*e^(18.5916-3991.11/(x+233.84))/15)))-0.0089)/1.029
    a=150-(2491.27-2.30285*a)*((0.622*(2*e^(18.5916-3991.11/(a+233.84))/15)/(100-(2*e^(18.5916-3991.11/(a+233.84))/15)))-0.0089)/1.029
    1481544*a^3-2370470400*a^2+1125973440000*a-142228224000000=0
    30+x^2=20x
    7.3y-2.6y
    1.79305=（（0.021*x^1.85+159）^0.5）*x^0.84
    m²-5m+3=0
    m²-3m-3=0
    [(1+2m)/m]²+(1-3m)/(2m)=5/2
    [(1+2m)/m]²+(1-3m)/2m=5/2
    1-1/x
    （1.7*10^7）*（1-2x）^2＝x/（0.02-x）
    1.7*10^7＝x/［（1-2x）^2（0.02-x）］
    (x-2)×(x-2)-4×4×(x-5)=0

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