1.73x＋x＝150
    998*x/30=20
    243t^2+2034t+4123=0
    π-arcsin(1-x*x)
    x-48=60%x
    70×1.5x十80×2x＝3655.17
    70×1.5x十80×1.5x＝3655.17
    2.14＾x
    2/3^x
    x^2-420x-122000=0
    0=x^2-140 x+4500
    600=X^2-140 x+4500
    1200=-2x*x+500x-30000
    sinx=0.685
    (x^3-x)^(1/2)+(x^3+x^2)^(1/2)=1
    sin x =0.685
    1.3x-x=150
    x^2=（x-4.5）^2+11.35^2
    2/3*（1100-x）=1/2x+150
    -3/2x=6

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