2x十0.5x＝
    X6-4=X8-18
    X6-4=X8-18
    X6-4=X18-8
    Xx6-4=Xx18-8
    0.8b+45+(600-b)=555
    (sqrt(x^2+1)+x)=1/(sqrt(x^2+1)-x)
    arctan(2x)-arctanx=arctan(x/(1+2x^2))
    （1.5－x）÷2＝1.05－x
    49.875=x*0.95-199.5
    6700/（x+11.88)+10000/(x+11.88)+10000/(x+11.88)=150
    6700/（x+11.88)+7500/(x+11.88)+10000/(x+11.88)=150
    6700/（x+11.88)+10000/(x+11.88)+10000/(x+11.88)=150
    2200=x/110*1000
    x²＝4
    x²＋x＝1200
    x²＋x＝600
    36x²－126x+29=0
    90*X+90*(X-2)=160*X
    0.8(1+x)/(0.12-x)=29.07

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