98*a^2-392*a+98=0
    2124/25*a^2-11248/25*a+2656/25=0
    116*a^2-592*a+140=0
    34.75*a^2-67*a+14=0
    -20-2.2x=1.13*[ln(-40-1.2x)/(x-20)]*(120+1.2x)
    14*a^2-28*a+6=0
    2.75*a^2-9*a+2=0
    （5.5-22.5a）*（7-29*a）-（6-25.5*a）^2=0
    （12-50a）*（1.5-2.5*a）-（9.5*a-2）^2=0
    37.44*ln[(7x-300)/(x-20)]*5=(7x-300)*(2x-200)
    28.28sin(100x-π/4)
    2860x^2+2116400x-171626040=0
     0.05*a∧3+0.6*a∧2+a+2.2
    0.05*a∧3+0.6*a∧2+a+2.2
    37.21x+x^2=729
    -2x^6+11x^4-13x^2+2 = 0
    -2x^3+11x^2-13x+2 = 0
    （a-1）/a=94.12%
    （a-1）/a=94.12%
    1.8^x=x

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