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

Toán Lớp 6: 27.(50 − 17) − 17.(50 − 27) ( tính nhanh)

Toán Lớp 6: 27.(50 − 17) − 17.(50 − 27) ( tính nhanh)

Comments ( 2 )

  1. 27. ( 50 – 17) – 17. ( 50 – 27)
    = 27. 50 – 27. 17 – 17. 50 + 17. 27
    = ( – 27. 17 + 17. 27) + 27. 50 – 17. 50
    = 0 + 50. ( 27 – 17)
    = 0 + 50. 10
    = 500
     

  2. Lời giải chi tiết:
    27.(50-17)-17.(50-27)
    =27.50-27.17-17.50+17.27
    =(27.50-17.50)-(27.17-17.27)
    =50.(27-17)-27.(17-17)
    =50.10-27.0
    =500-0
    =500

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

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