r*r/100/23.40/23.40=0.366*48*24*lg(r/0.175)
    x=16(49/144)^2
    (x^2-x-10)^2=4x+36
    1.2x=0.9657(1-0.2x²)
    tan(x)=(x+35)/(sqrt(60*60-35*35)+sqrt(110*110-35*35)-60)
    x²(x²+1)(0.04x²+1)=8.64×64
    x²(x²+1)(0.04x²+1)=64
    x+1.27×（10-x）=12
    (16-3x)(160+120x)=4200
    (5+x)(70-2x)=600
    (16-3x)(160+120x)=3640
    (38-22-3x)(160+120x)=3640
    x²-16x-64=0
    2x²=(x+8)²
    x²-8x-64=0
    x²+8x-64=0
    x²+5x-2250=0
    3/x-1
    x+x/1.13*0.1=266000
    x+x/1.13*0.1=349900

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