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

Toán Lớp 6: Tính nhanh : (1.5.6 + 2.10.12) : (1.3.5 + 2.6.10) 43.27 + 93.43 + 57.61 + 59.57 64.6 + 81.4 + 17.6

Toán Lớp 6: Tính nhanh :
(1.5.6 + 2.10.12) : (1.3.5 + 2.6.10)
43.27 + 93.43 + 57.61 + 59.57
64.6 + 81.4 + 17.6

Comments ( 2 )

  1. (1.5.6 + 2.10.12) : (1.3.5 + 2.6.10)
    = ( 5.6 + 8 . 5 . 6) : ( 3.5 + 8 . 3 . 5)
    = [ 5.6( 1+8)] : [3.5 ( 8 + 1)]
    = \frac{ 5.6 . 9}{3 . 5 . 9}
    = \frac{2}{1} = 2

  2. Lời giải và giải thích chi tiết:
     (1.5.6+2.10.12):(1.3.5+2.6.10)
    =(5.6+8.5.6):(3.5+8.3.5)
    =[5.6(1+8)]:[3.5(1+8)]
    =6:3=2

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