4x^2-2x+1=0
    3.9%-b/1+b=48%
    3.9%-b/1+b=48%
    （2k- 1）^2
    （2k- 1）^
    x^2+6.8x-26.88 = 0
    x^2+6.8x+26.88=0
    (x-250)*{(290-x)/5*4+8}
    4a＝1/（3a）
    4a＝1/3a
    tanx=1/3
    9-x²=25-（3+x）²
    8+3-x+2x = 12
    8+3x-x+2x=12
    3x^2-2=4x
    （1+r）/（1+0.12）=0.9325
    9.6²+（x+2）²=12²
    9.6²+（x+2）²=16²
    100xx − 1250x − 2100 = 0
    x+x/5=6/7

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