2.2/87-40/1650-10/125+X/131=0.00167（X+52.2)
    10x*1.5+40x=1350
    400*180*(5-2*x)/(5-x)+54*(180*900*x*400/900+180*600*(5-x)*9/4)/(75*180*5/900/(5-x)+71*180*900*x^2/30^4+71*180*600*(5-x)^2/20^4)=0
    （25984.14-X/1.01*0.01）*1.12 = 302108.91-X
    （25984.14-X/1.01*0.01）*1.12=314696.78-X
    (X-X/1.09*0.03)*0.02=20422.02
    (X-X/1.09*0.03)*0.02=53972.49
    x×2.75＝163.336-x
    x×2.55＝163.336-x
    x×2.35＝163.336-x
    x×2.15＝163.336-x
    x×1.95＝163.336-x
    x×1.75＝163.336-x
    cosx=-0.3
    3Q^{2}-20Q-75=0
    9Q^{2}-40Q-75=0
    -4a=4
    a=1 ax2
    c=1+9
    2+3=c c=

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