（x-110）*(x-225)=11250
    x^3-140x+600x-192000=0
    0.6x^4-27x^2-1=0
    2sinx/sin（150-x）=sin110/sin40
    10:x=12:8
    0.96x^4-3.74x^2-1=0
    2sinx/sin（x+30）=-sin110/sin40
    33-3.5*6
    sinx/sin（x+30）=-sin110/2sin40
    18*14+72
    18*14
    1.03*6
    3.47*6-11*3
    0.6x^4-27x^2-30=0
    1-3x÷5＝(5x-1)÷9
    0.5x^(2)+x=0.0069
    0.5x^(2)+x=0.018
    0.5x^(2)+x=0.227
    0.5x^(2)+x=0.033
    6x^(2)-3x-x^(3) = 10

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