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

Toán Lớp 8: Thu gọn: C = 48.(5^2 + 1) (5^4 + 1) (5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64+ 1)

Toán Lớp 8: Thu gọn: C = 48.(5^2 + 1) (5^4 + 1) (5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64+ 1)

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     C = 48 . (5^2 + 1)(5^4 + 1)(5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64 + 1)
        = 2 . 24 . (5^2 + 1)(5^4 + 1)(5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64 + 1)
        = 2 . (5^2 – 1)(5^2 + 1)(5^4 + 1)(5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64 + 1)
    Áp dụng hằng đẳng thức A^2 – B^2 = (A – B)(A + B), ta được:
    C = 2 . (5^4 – 1)(5^4 + 1)(5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64 + 1)
        = 2 . (5^8 – 1)(5^8 + 1)(5^16 + 1)(5^32 + 1)(5^64 + 1)
        = 2 . (5^16 – 1)(5^16 + 1)(5^32 + 1)(5^64 + 1)
        = 2 . (5^32 – 1)(5^32 + 1)(5^64 + 1)
        = 2 . (5^64 – 1)(5^64 + 1)
        = 2 . (5^128 – 1)
        = 2 . 5^128 – 2

  2. Giải đáp+Lời giải và giải thích chi tiết:
     C=48(5^2+1)(5^4+1)(5^8+1)(5^16+1)(5^32+1)(5^64+1)
    =2.24.(5^2+1)(5^4+1)(5^8+1)(5^16+1)(5^32+1)(5^64+1)
    =2.(5^2-1)(5^2+1)(5^4+1)(5^8+1)(5^16+1)(5^32+1)(5^64+1)
    =2(5^4-1)(5^4+1)(5^8+1)(5^16+1)(5^32+1)(5^64+1)
    =2(5^8-1)(5^8+1)(5^16+1)(5^32+1)(5^64+1)
    =2(5^16-1)(5^16+1)(5^32+1)(5^64+1)
    =2(5^32-1)(5^32+1)(5^64+1)
    =2(5^64-1)(5^64+1)
    =2(5^128-1)
    =2.5^{128}-2

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