3*(5X+1)-48=0
    80/（80+x）=0.8
    a+2=3
    0.260x-0.151X=0
    2700*（1+X）^3=2715
    （-2）^n
    x^3+1=0
    28×7.3+11.99c=（28+c）×7.97
    28×7.3+11.99c=（28+c）×7.98
    (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

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