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

Toán Lớp 6: b) B= 1.3.5+3.5.7+…+95.97.99 c) C=1.99+3.97+5.95+-+49.51

Toán Lớp 6: b) B= 1.3.5+3.5.7+…+95.97.99
c) C=1.99+3.97+5.95+….+49.51

Comments ( 2 )

  1. Giải đáp:
     b)B=11517600
    Lời giải và giải thích chi tiết:
    L=1.3.5+3.5.7+5.7.9+….+95.97.99
    8L=1.3.5.8+3.5.7.8+5.7.9.8+….+95.97.99.8
    8L=1.3.5.(1+7)+3.5.7.(9−1)+5.7.9.(11−3)+….+95.97.99.(101−93)
    8L=1.3.5+1.3.5.7−1.3.5.7+3.5.7.9−3.5.7.9+5.7.9.11+…−93.95.97.99+95.97.99.101
    8L=1.3.5+95.97.99.101
    L=1.3.5+95.97.99.1018

  2. b) B= 1.3.5+3.5.7+…+95.97.99
    c) C=1.99+3.97+5.95+….+49.51

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

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