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

Toán Lớp 7: 1.2+2.4+3.6+4.8+5.10/3.4+6.8+9.12+12.16+15.20

Toán Lớp 7: 1.2+2.4+3.6+4.8+5.10/3.4+6.8+9.12+12.16+15.20

Comments ( 2 )

  1. {1.2 + 2.4 + 3.6 + 4.8 + 5.10}/{3 . 4 + 6 . 8 + 9 . 12 + 12 . 16 + 15 . 20}
    = {2 + 8 + 18 + 32 + 50}/{12 + 48 + 108 + 192 + 300}
    = {[(2 + 8) + (18 + 32)] + 50}/{[(12 + 48) + (108 + 192)] + 300}
    = {10 + 50 + 50}/{60 + 300 + 300}
    = {10 + 50 . 2}/{60 + 300 . 2}
    = {10 + 100}/{60 + 600}
    = 110/660
    = 1/6
     

  2. Giải đáp:
     1/6
    Lời giải và giải thích chi tiết:
    (1.2+2.4+3.6+4.8+5.10)/(3.4+6.8+9.12+12.16+15.20)
    = (2 + 8 + 18 + 32 + 50)/(12 + 48 + 108 + 192 + 300)
    = [(2 + 8) + (18 + 32) + 50]/[(12 + 48) + (108 + 192) + 300]
    = (10 + 50 + 50)/(60 + 300 + 300)
    = 110/660
    = 1/6

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

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