256（x+1）^2=400
    x=0.0188*(51/(0.0147/(3.14*x^2)))^0.5
    720x=800(x-3)+1200
    1/x/x
    0.1625x+10.5625＝0.0216x^2
    12x^2-80x+96=0
    3（x-1）（x-3）
    (3.3-X)/63=55.1*X/255
    280x=240*（x+4）
    x+1/x=37/6
    a^2+80a-2400=0
    a^2+80a-2400=a
    arcsin（sinx）
    （62.9*0.97-X）*0.855*0.92-62.9*0.5=（（114*0.97-23）*0.855*.92-114*0.5）*0.55
    (62.9*0.97-X)*0.83-X*0.02-62.9*0.5=((114*0.97-23)*0.83-23*0.02-114*0.5)*0.55
    （62.9*0.97-X）*0.855*0.92-62.9*0.5=（114*0.97-23）*0.855*.92*.55-114*0.5*0.55
    31.3+x-x*0.015=50
    (62.9*0.97-X)*0.83-X*0.02-62.9*0.5=((114*0.97-23)*0.83-23*0.02-114*0.5)*0.55
    (62.9*0.97-X)*0.83-X*0.02-62.9*0.5=((114*0.97-X)*0.83-X*0.02-114*0.5)*0.55
    （62.9*0.97-X）*0.855*0.92-62.9*0.5=（（114*0.97-23）*0.855-114*0.5）*0.55

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