2^x=4
    1^x=1
    x^3=1
    -x^2＝1.5
    t^2-12t-20=0
    1000*(x+1)*(x+0.1+1)=1560
    1000x(x+1)(x+1.1)=1560
    a2+a=90
     -4082750+3000000+x-1500*12%/4-x*10%/4 = 300000
     -4082750+3000000+x-1500*12%/4-x+10%/4 = 300000
    -4082750+3000000+x-1500*12%/4-x+10%/4
    4a^2-3a=0
    4x^3+3x^2+1=0
    2^a-a=√2-0.5
    2^（2^a）=e
    log（2，e）=2^a
    2^a-a=√2-0.5
    2^a-a=√2-0.5
    2^a-a=√2-0.4
    2^a-a=√2-0.5

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