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

Toán Lớp 6: 3. 5 mũ 2 -27 : 3 mũ 2 +5 mũ 2 . 4 – 18 : 3 mũ 2

Toán Lớp 6: 3. 5 mũ 2 -27 : 3 mũ 2 +5 mũ 2 . 4 – 18 : 3 mũ 2

Comments ( 2 )

  1. $\text{3. $5^{2}$ – 27 : $3^{2}$ + $5^{2}$. 4 – 18 : $3^{2}$ }$ $\\$ $\text{= 3. 25 – 27 : 9 + 24. 4 – 18 : 9}$ $\\$ $\text{= 75 – 3 + 100 – 2}$ $\\$ $\text{= 72 + 100 – 2}$ $\\$ $\text{= 172 – 2}$ $\\$ $\text{= 170}$  

  2. 3 . 5^2 – 27 : 3^2 + 5^2 . 4-18:3^2
    = (3.5^2 + 5^2 . 4) – ( 27 : 3^2+18 : 3^2)
    = [(3+4).5^2] – [(27+18):3^2]
    = [7.25] – [45:9]
    = 175-5
    = 170
     

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