a*a+5a+25=0
    2000(x+1)²-1000(x+1)=1320
    2850+200x=1650+100x
    2850+200x=1650+50x
    2000x²-1000x=1320
    2000x²-100x=1320
    （50+x- 30）（500-10x）＝12000
    x²+x=68
    (x-40)(20+2(60-x))＝400
    x²+x=68
    x=4×10^（-3）×（1-（15-x×（7000））/-4）^2
    x=4×10^（-3）×（1-（15-x×（7000））/4）^2
    4X+1/4X+3=4/3
    x+16=2x-21
     4X+1/4X+3
    x^2*(82.36-0.5x)/[(0.24-x)^2*(7.52-x)]=10000
     x/{(0.24-x)*[[(7.52-0.5x)/(82.36-0.5x)]^0.5]} = 100
    (160+40(38-x))(x-22)＝3640
    1500-1500/(5.6*x)*0.2*x-5.4*x=0
    x/{(0.24-x)*[(7.52-0.5x)/(82.36-0.5x)]^0.5} = 100

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