68.3687 + ( (0.0828135 - 68.3687) / (( 1 + (x/44371.4)^0.981905))^10 )=1.211
     (50*707 /r/(600-r) -1)(50* 707 /r/(600-r) -1)=1/r
     (50*707 /r(600-r) -1)(50* 707 /r(600-r) -1)=1/r
    （(2584+1000-6140)/6140)*0.5=((1845+X)-3716)/3716
    x+x*0.03=213.8
    （8980+30+X）*3.4%=4X
    -5y=-5
    tan(x/1）
    （(2584+1352-6140)/6140)*0.5=((1845+X)-3716)/3716
    56^2+26^2＝x^2+50.576660^2
    56*56+26*26＝x^2+5.483340^2
    y^2-56*y+277＝0
    953*a^2-53368*a+263981＝0
    59.594738^2+a^2＝3812
    170*a^2+24778*a-2080399＝0
    （x+1）*ln(x+1)
    tanx=x/6
    （20-x）（100+10x）=2240
    （y-750）（250-1/5y）=12000
    （y-750）（250-1/5）=12000

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