x+(4.9/340)*x^2=13
    10t^2-72t+72
    150（1+x）²=216
    （5/9）x²-（[5/3）-1]x+（10/9）-1=0
    [-（3m-1）]²-4（2m-1）=0
    x(62-2x)=480
    9m²-2m+5=0
    5（x+1）²=7.2
    （10+x）（500-10x）=8000
    X^2 -x- 3/4=0
    （x-10）（240-8x）-168=600
    （x-10）（240-x）-168=600
    (60-x)(200+20x)=22500-2000
    100*cos(x)/(sin(x))^2+510*sin(x)-200/(sin(x))^2=0
    -100*cos(x)/(sin(x))^2-510*sin(x)＋200/(sin(x))^2=0
    -100cos(x)/(sin(x))^2-510sin(x)＋200/(sin(x))^2=0
    612=0.5x×0.005×0.005+0.005x×0.595
    12x2+40x+21=0
    x²+12.8x-656=0
    x²-12.8x-656=0

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