x＾4-11x＾3+39x＾2-49x+18=0
    x＾4-10x＾3+32x＾2-38x+15=0
    151.91+12.51y=22.85y+26.52
    0*x＾4+x＾3-13x＾2+51x-63=0
    (50+18×0.8+18.3×0.9+16.9×8.93+16.9×y)×0.74-2×11.4×0.86
    0*x＾4-0*x＾3+6x＾2-52x+102=0
    2x^3+3x^2-15x+2=0
    x＾4-(8+5)x＾3+(6*8+3)x＾2-(9*8-5)x+3*8=0
    x＾4-(7+5)x＾3+(6*7+3)x＾2-(9*7-5)x+3*7=0
    x＾4-(6+5)x＾3+(6*6+3)x＾2-(9*6-5)x+3*6=0
    x＾4-(5+5)x＾3+(6*5+3)x＾2-(9*5-5)x+3*5=0
    x＾4-9x＾3+27x＾2-31x+12=0
    x＾3-6x＾2+8x=0
    -x＾3+12x＾2-46x+58=0
    x＾3-15x＾2+69x-99=0
    2x^4+9x^3-9x^2+2=0
    sqrt2sin（2x-π/4）-1
    exp(-(x/83.23206)^0.65237)=0.5
    lnx=(x/2)-1/2
    lnx=x/2+1/2

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