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

Toán Lớp 8: (10 ² + 8 ² +6 ² + 4 ² ) – (9 ² + 7 ² + 5 ² + 3 ² + 1 ²)

Toán Lớp 8: (10 ² + 8 ² +6 ² + 4 ² ) – (9 ² + 7 ² + 5 ² + 3 ² + 1 ²)

Comments ( 2 )

  1. $\\$
    Giải đáp + giải thích các bước giải :
    $(10^2+8^2+6^2+4^2)-(9^2+7^2+5^2+3^2+1^2)\\=10^2+8^2+6^2+4^2-9^2-7^2-5^2-3^2-1^2\\=(10^2-9)^2 + (8^2-7^2)+(6^2 – 5^2)+(4^3 – 3^2) – 1^2\\=10+9+8+7+6+5+4+3-1\\=(10+9+8+7+6+5+4+3)-1\\=\dfrac{(10+3).8}{2}-1\\=52-1\\=51$
     

  2. câu hỏi:
    (10 ² + 8 ² +6 ² + 4 ² ) – (9 ² + 7 ² + 5 ² + 3 ² + 1 ²)
    đáp án:
    =216-165
    =51

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

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