(150+296.5)/30*x+185/30*(x+15)+120/30(x+30)=1476
    (135+281.5)/30*x+208/30*(x+15)+90/30(x+30)=1436
    (72+281.5)/30*x+208/30*(x+15)+90/30(x+30)=1436
    13-67x=88x
    (x-2)^2+4*x-20=0
    145*10^7=13.8*200*x*（460-0.5x）
    x∧3－6x∧2＋3x－1＝0
    2012.5=(80.5+x)*(30-x)
    3x=2
    （x+1）*x=30
    (199+240)/30*x+226/30*(x+15)+120/30(x+30)=1593
    a+a×0.01=297
    x-5=10
    x/18=8/x
    x/18=15/x
    x^2=1+x
    x^2+1=0
    9(a+1)=9
    2/3=10.4t+3*t^2
    2/3=12.2t+3*t^2

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