78*x^100-88*x^50-80*x^25-100
    7*x^50-8*x^40+80*x^9-100
    7*x^50-8*x^40+80*x^9+100
    X+X*5%=227927.72
    x*（x+1）=227927.72
    tanx
    2^（2-t）=0.2
    2400*X=87.86
    10.2708=0.000422*A+0.137*A^0.4
    10.2708=A*(0.137*(A^-0.6)+0.000422
    4(x-1)^3+2(x-2)^2=0
    Z^2=-1
    i^3=1
    x*0.03=324.99
    i^3=2
    i=1
    i^2=-1
    a+1+1-1-1=0
    7200/x=6480/x+9
    ((2a+1)^2-1)÷2=8

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