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

Toán Lớp 6: Thực hiện phép tính : a. $2^2$ . 85 + 15 . $2^2$ – $2020^0$ b. 123 . 456 + 456 . 321 – 256 . 444

Toán Lớp 6: Thực hiện phép tính :
a. $2^2$ . 85 + 15 . $2^2$ – $2020^0$
b. 123 . 456 + 456 . 321 – 256 . 444

Comments ( 2 )

  1. $\text{a) 2². 85 + 15. 2² – $2020^{0}$}$ 
    $\text{= 2². ( 85 + 15 ) – 1}$
    $\text{= 4. 100 – 1}$
    $\text{= 400 – 1}$
    $\text{= 399}$
    $\text{b) 123. 456 + 456. 321 – 256. 444}$
    $\text{= 456. ( 123 + 321 ) – 256. 444}$
    $\text{= 456. 444 – 256. 444}$
    $\text{= 444. ( 456 – 256 )}$
    $\text{= 444. 200}$
    $\text{= 88 800}$
    $\text{Xin hay nhất và 5 sao ạ}$

  2. $a) 2^{2} . 85 + 15 . 2^{2} – 2020^{0}$
    $= 4 . 85 + 15 . 4 – 1$
    $= 4 . (85 + 15) – 1$
    $= 4 . 100 – 1$
    $= 400 – 1$
    $= 399.$
    $b) 123 . 456 + 456 . 321 – 256 . 444$
    $= 456 . (123 + 321) – 256 . 444$
    $= 456 . 444 – 256 . 444$
    $= 444 . (456 – 256)$
    $= 444 . 200$
    $= 88800.$

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

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