1/3×3/4÷4/3-5/12
    log(48)/log(2)*5
    log(48)/log(2)
    log(1000000, 2)
    2-2^(-52)
    (〖(10%)〗^2-7%*10%*(-0.5))/(〖(7%)〗^2+〖(10%)〗^2-2*7%*10%*(-0.5))
    sin90=
    （100-104）/（100-108.11）
    45645÷543
    1/(sqrt(3)-sqrt(2))
    -10000+8000/(1+0.135628+2500/(1+0.135628^2+2000/(1+0.135628)^3
    -2000+500/(1+0.135628+700/(1+0.135628^2+2000/(1+0.135628)^3
    0.616438^2*7%^2+0.383562^2*10%^2+2*0.616438*0.383562*(-0.5)*0.7%
    523+5
    1-0.616438
     (0.01+0.0035)/(0.0049+0.01+0.007)
    (0.01+0.0035)/(0.0049+0.1+0.007)
    sqrt(0.001975)
    0.25*0.07*0.07+0.25*0.01-0.25*0.07*0.1
    sqrt(0.01315)

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