8m-12-m^2+8m-16
    (2x-26)*(x-10)=3
    32x/700=87808/247808
    x^2+0.675x-0.21875
    (√x^2+400)+x=40
    x^2-1.175x+0.0125=0
    0.0044x^3-0.14x^2+1.49x-1.94=2.26
    0.0071x^3-0.28x^2+3.63x-12.47=2.215
    0.0044x^3-0.14x^2+1.49x-1.94=-0.0009x+3.13
    0.0044x^3-0.14x^2+1.49x-1.94=-0.0009x+3.13
    0.0044x^3-0.14x^2+1.49x-1.94=0.0079x+1.38
    0.0071x^3-0.28x^2+3.63x-12.47=-0.002x+3.14
    0.0071x^3-0.28x^2+3.63x-12.47=0.0047x+1.29
    (40-x)(10+x/2*10)=6000
    x^2-20x+400=6000
    7250000＝7200（1000-1200b）
    6x²+168x-176＝100
    6x²－148x－102＝0
    170x-x²=7200
    (200+180x)×(400-50x)

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