50000=（100-x）*1800-50000
    50000=（x-50）*1800-50000
    50000=1800-50000*（x-50）
    x-（x*0.46%）=188825
    arc(0.026816)
    arc 0.026816
    arc0.026816
    2arctg1.5361
    arctg1.5361
    （3000-x）/x=0.72
    3000-x/x=0.72
    3(3x^2+1+6x)/((1+x)^2)=1.8
    x*6+x*0.5=30702
    2*5/7-B=2
    r^{3}=54r-135
    x∧4-2x∧3＋3x∧2-2x＋1=0
    49.8+23.7+15X=23.5X
    49.8+14.6+15X=23.5X
    18+9.1+53.8+12.4X=23.5x/1.2
    18+9.1+53.8+12.4X=23.5x

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