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

Toán Lớp 5: Tính nhanh : c ) 15,2 x 34,5 + 15,2 x 47,5 + 84,8 x 82

Toán Lớp 5: Tính nhanh :
c ) 15,2 x 34,5 + 15,2 x 47,5 + 84,8 x 82

Comments ( 2 )

  1. c ) 
    15,2  x  34,5 + 15,2  x  47,5 + 84,8  x  82
    =15,2  x (34,5 +47,5) + 84,8 x 82
    =15,2  x 82 + 84,8 x 82
    =82  x (84,8+15,2)
    =82 x 100
    =8200

  2. 15,2 × 34,5 + 15,2 × 47,5 + 84,8 × 82
    = 15,2 × (34,5 + 47,5) + 84,8 × 82
    = 15,2 × 82 + 84,8 × 82
    = 82 × (15,2 + 84,8)
    = 82 × 100
    = 8200

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