50x^20+50x^19+50x^18+50x^17+50x^16 =668.23
    50x^15+50x^14+50x^13+50x^12+50x^11 =413.26
    50x^10+50x^9+50x^8+50x^7+50x^6 =302.576
    50x^25+50x^24+50x^23+50x^22+50x^21= 900.975
    (x-22)(160+1520-40x)=3640
    (x-22)(160+1520-40x)=3640
    X+sinX=0
    50x^20+50x^19+50x^18+50x^17+50x^16 =640.975
    X+sinX=0
    (x－22)[160+40(38－x)]
    50x^15+50x^14+50x^13+50x^12+50x^11 =428.7
    50x^10+50x^9+50x^8+50x^7+50x^6 =292.025
    （x- 30）*（400-10（x- 40）=5250
    118.08÷4.5959X
    (EBIT-400*0.05-600*0.06)*(1-25%)/80 = (EBIT-400*0.05)*(1-25%)/100
    (EBIT-20-36)*0.75/80 = (EBIT-20)*0.75/100
    (EBIT-20-36)/80=(EBIT-20)/100
    (EBIT-20-36)/80=(EBIT-20)/100
    x-(x*13%-0.09)*12%=
    30×8.07+100.6×7.93=130.6x

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