x^2 - 11.5 x+ 32.8=0
    x^2 - 12.7 x + 36.9 = 0
    -0.018*x+0.45*x=58000
    0.018*x-0.45*x=58000
    x^2-10.4 x+ 11.8
    18x^x-6442=0
    12x*x+44x+3=0
    12x*x+44x+2=0
    x²+2x+9
    9x^2+180x+6000=9600
    y+（y-1）/（y+1）-1/y+（1+y）/（1-y）＝3
    2x2+11234x+114514=0
    1÷t
    (1-sqrt(4+3))/(1+sqrt(4+3))=(x+1)/(x-1)
    x+1.5x=150
    5*x*x+12*x+3=0
    0.09*x=90*0.91
    346-346/1.09*0.05-（346/1.09*0.09-X/1.09*0.09）-346*0.03=X
    x²-6x-18=0
    ¾sinx

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