abs(x-1)+abs(x-2)+abs(x-3)...abs(x-100)
    x（x+2）（x+4）=3315
    3+20*(3/x)+6=9+20*(9/x)
    5*x+14.4=8*x+7.2
    (14.4/5*x)/(7.2/8*x)=2
    (x+1)*(8/x)=(x+2)*(5/x)
    ((1/x)+(1/10))*0.5=((1/x)+(1/30))*0.3
    (（0.45/x+4.5）+(1/10))*0.3=x
    X/126+20/131-(75-X)/1000=0.524
    115（1-x）=77
    -3b+1/2=2b+5/3 -1
    1a+5=23-a
    1.95*10^(-3)=(x^2)/((6-2*x)^2)
    1.95*10^(-3)=(x^2)/(6-2*(x^2))
    2d^3+9d^2+12d+8=0
    3x20.5
    3x-8=33+x
    X∧2+X=0.0000177
    X/111-3/44.7-(97-X)/1000=0.286
    20x/(2.2*(1+0.01*2.2^2))=1

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