4.136×10^(-15)×3×10^8×10^9÷805=0.41+(0.0252a^2+0.283a)^(-1)
    2x
    2.469×10^(-15)=0.41+(0.0252a^2+0.283a)^(-1)
    6.626×10^（-34）×3×10^17÷805b=1
    6.626×10^（-34）×3×10^17÷805=b
    2a=1
    6.626×10^（-34）×3×10^17÷805=0.41+(0.0252a^2+0.283a)^(-1)
    a^4-(10-4√2)a^2+33=0
    a^4-(10+4√2)a^2+33=0
    a^4-(10+4√2)a^2+25=0
    4x-200=4200
    (x+2)(x+3)(x+4)=990
    X^3-x
    0.9973x^2-3.28x+2=0
    0.9973x^2-3.28x+2=0
    5406511660×X-13109500sin（2×3.14×X）-2218410000=0
    （2+x）*16=64
    2s^3+9s^2+13s+5=0
    2x^3+9x^2+13x+5=0
    －6－3x=1

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