354/30*x+155.5/30*(x+15)+90/30(x+30)=918
    2x^5-x^4+4x^3-2x^2-48x-1=0
    x^6+26x^4+100x^2=3600
    x^2+26x+100=0
    30x+24*3x+36*36x=2354.04
    18*24x+36*22x=2009.88
    30*3x+24*9x+36*36*3x=2354.04
    18*24*3x+22*36*3x=2009.88
    ln（1+x/1-x）
    xxx-3x-2=0
    5000x^2+25x-5
    500x^2+25x-5=0
    xxx+4xx-21x+2=0
    (176+265.5)/30*x+188/30*(x+15)+120/30(x+30)=1332
    (sinx)^3+(cosx)^4
    K=2204+66.12+0.01K+40.44+0.0002K+577.64+0.0026K+0.0538K
    K=2466.5+74+0.01K+45.28+0.0002K+853.31+0.0034K+0.0538K
    （x-1.401）*500-0.1=2
    V=311.59+0+9.35+0.01V+10.91+0.0002V+26.55+0.0008V+0.0538V
    X*0.06+X=640000

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