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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: ( $\frac{-3}{2}$)^2 + ($\frac{-1}{2}$)^25) : ($\frac{-1}{25}$) – $\sqrt[]{}$ $\frac{25}{4}$

Toán Lớp 7: ( $\frac{-3}{2}$)^2 + ($\frac{-1}{2}$)^25) : ($\frac{-1}{25}$) – $\sqrt[]{}$ $\frac{25}{4}$

Comments ( 2 )

  1. ((-3)/2)^2 + ((-1)/2)^25 : ((-1)/25) – sqrt{25/4}
    = 9/4 + (-1)/625 · (-25) – 5/2
    = 9/4 + 1/25 – 5/2
    = 225/100 + 4/100 – 250/100
    = (-21)/100 

  2. (-3/2)^2 + (-1/2)^25 : (-1/25) – sqrt(25/4)
    = 9/4 + (-1)/2^25 : (-1/25) – sqrt25/sqrt4
    = 9/4 + (-1)/2^25 : (-1/25) – 5/2
    = (-1)/4 + (-1)/2^25 : (-1/25)
    = (-1)/4 + (-1)/2^25 : (-1/25)
    = (-1)/4 + (-1)/2^25 . 25/(-1)
    = (-1)/4 + 25/2^25
    = (-2^25+100)/4.2^25
    = [4.(-2^23+25)]/4.2^25
    = (-2^23 + 25)/2^25

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222-9+11+12:2*14+14 = ? ( )

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