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

Toán Lớp 6: Cho A=4+2^2+2^3+2^4+-.+2^20. Chứng minh rằng A=2^21

Toán Lớp 6: Cho A=4+2^2+2^3+2^4+…..+2^20. Chứng minh rằng A=2^21

Comments ( 2 )

  1. A=4+2^2+2^3+2^4+…..+2^20
    A=2^2+2^2+2^3+2^4+..+2^20
    =>A=2^2×2+2^3+2^4+..+2^20
    =>A=2^3+2^3+2^4+..+2^20
    cứ thế cho đến khi kết quả bằng 2^21

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