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
    0.96=[(2.4^n+1)-2.4]/[(2.4^n+1)-1]
    0.96=[(3.4^n)-1]/3.4^n
    0.96=[(25^n)-1]/25^n
    2(1+x)²=2.42
    （5*（23+X）+1*1）/（24+X）=4.9
    120000=83642*1.025^（x-1）

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