d-5/8=2/5
    n-3.4=1.6
    3X^2+12X+8=0
    a/10%=8
    0.2x+x＝12
    330×3041=11.5×990×x+330×452
    0.2x+x12
    330×3041=11.5×9900×x+330×452
    3x^2+6x+2=0
    sin(x) = (1-cos(x))*20924.535
    sin(x) = (1-cos(x))*12924.535
    sin(x) = (1-cos(x))*2924.535
    sin(x) = (1-cos(x))*5924.535
    A*10%/4>=300000
    sin(x) = (1-cos(x))*10924.535
    sin(x) = (1-cos(x))*9924.535
    sin(x) = (1-cos(x))*13924.535
    sin(x) = (1-cos(x))*6924.535
    （2505/tan(180-x)+510）*6.28*(180-x)/360 = 3850/2
    （2505/tan(180-x)+510）*6.28*(180-x)/260 = 3850/2

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