x×x/（1-x）/（1-x）＝1.39
    x×x/（1-x）×（1-x）＝1.39
    125000000=9.6×250×(460-0.5x)x
    125000000=9.6×250×(460-0.5x)
    2x = 7+4x
    2 / x =7 / x
    (6000-x)÷10×5-10x = 2475
    56-5x=61
    -x²+680x-10890=0
    X²-75x+350=0
    (x+4)²=5(x+4)
    10.5x+（530-x）*19.3=35*19.3*10.5
    10.5x+（530-x）*19.3=35*19.310.5
    -1x^2-11x
    (100-2X)(50-2X)=3600
    10.5x+（530-x）*19.3=35*193*105*0.01
    105x+（530-x）*193=35*193*105
    10500x+（530-x）*19300=35*19300*10500
    100/（1+x）+100/（1+x）^2+100/(1+x)^3+1100/(1+x)^4=1140
    x^3+9x^2+1928.928888727x=9288

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