4800-120*x-2*((80-2*x)*x)=2400
    x^3+4x^2-9x-35＝0
    （60-2*x）*(22-2*x) = 600
    （60-2*x）*(22-2*x)
    （26.326+x）×1.55＝52.652+70.778-x
    （26.326+x）×1.75＝52.652+70.778-x
    （26.326+x）×1.95＝52.652+70.778-x
    （26.326+x）×2.15＝52.652+70.778-x
    （26.326+x）×2.35＝52.652+70.778-x
    （26.326+x）×2.55＝52.652+70.778-x
    (1−x^8)÷(1−x^4)=17
    x^10+2^10-4*x=6131066258749
    12.25×c=（3.3+c）×7.92
    12.25×c=（3.3+c）×7.93
    1/(x+20)=1/x+(2x+20)/(x²+20x+200)
    x²-12.8x+32.6=0
    3x/2x=100
    3/2*x=100
    3/2x=100
    ln（1/2+x）

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