x^3-1.8x^2+0.32x+0.52=0
    3.6*3.6+(x-2.4)²=xx
    (2.1)^(1-x)=1.69
    x^3+1/3*x+2/3
    (1.69)^(1-x)=2.1
    e^x^2sinx
    a×0.6=19.9
    a×0.6=38.9
    a×0.6=22.9
    1.0787x/(20+1000x)=0.0002
    2430/（x+6）＝2160/x
    2430/（x+6）＝7200/x
    2430/x+6＝7200/x
    3x＾2-20x+25=0
    1.0787x/(20+1.0787x)=0.0002
    108x^5+10.8x^4+0.27x^3=2*10^-29
    x/1.639=(1-x)*(1-0.5x)^0.5
    83t×t+76t-60=0
    xxx-18xx+33x-16=0
    x（30-3x）=80

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