tinh gia tri bieu thuc 80 – (4.5^2 – 3 . 2^3 ) 5^6 : 54 + 2^3 . 2^2 – 12017 125 – 2.5 [ 56 – (48 : 15 – 7 ) ] 34 . 6 – [131 – ( 15 – 9^2 ) ]

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1. Đáp án:

    

   Giải thích các bước giải:

    

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2. Đáp án:

    

   Giải thích các bước giải:

   $\text{a) 80 – (4.$5^{2}$ – 3.$2^{3}$).}$

   $\text{= 80 – (4.25 – 3.8).}$

   $\text{= 80 – (4.25 – 3.2.4).}$

   $\text{= 80 – (4.25 – 6.4).}$

   $\text{= 80 – 4.(25 – 6).}$

   $\text{= 80 – 4.19.}$

   $\text{= 4.20 – 4.19.}$

   $\text{= 4.(20 – 19).}$

   $\text{= 4.1.}$

   $\text{= 4.}$

   $\text{b) $5^{6}$ ÷ $5^{4}$ + $2^{3}$.$2^{2}$ – 12017.}$

   $\text{= $5^{2}$ + $2^{5}$ – 12017.}$

   $\text{= 25 + 32 – 12017.}$

   $\text{= 57 – 12017.}$

   $\text{= -11960.}$

   $\text{c) 125 – 2.5.[56 – (48.15 – 7)].}$

   $\text{= 125 – 10.[56 – (720 – 7)].}$

   $\text{= 125 – 10.(56 – 713).}$

   $\text{= 125 – 10.(-657).}$

   $\text{= 125 + 6570.}$

   $\text{= 6695.}$

   $\text{d) 34.6 – [131 – (15 – $9^2$)].}$

   $\text{= 204 – [131 – (15 – 81)].}$

   $\text{= 204 – [131 – (-66)].}$

   $\text{= 204 – (131 + 66).}$

   $\text{= 204 – 197.}$

   $\text{= 7.}$

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