x^2=-x^2
    0^x=1
    0^x=0
    x=0^-1
    x=0^0
    （54-tw）^0.75＝0.425（tw－43）
    x=0^0
    x=0^0
    x+1=x
    (x^2)^0.5=x
    x^2^0.5=x
    x^0=1
    1^x=1
    1^x=2
    5*（2+a)-5-a-3*(a+2)/2=5
    [(0.002-X)*1200*10]/0.01=[(0.003-X)*800*10]/0.02
    2*X-1=X+4
    x+1=2
    ig0.04=
    ig0.04=

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