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

Toán Lớp 4: Bài 5: Tính nhanh : (4/5 x3/8 +4/5 x5/8-4/5 x7/8 ) :1/2

Toán Lớp 4: Bài 5: Tính nhanh : (4/5 x3/8 +4/5 x5/8-4/5 x7/8 ) :1/2

Comments ( 2 )

  1.  
    Lời giải và giải thích chi tiết:
    (4/5 . 3/8 +4/5 . 5/8-4/5 . 7/8 ) :1/2
    =4/5.(3/8+5/8-7/8):1/2
    =4/5:1/8:1/2
    =1/10:1/2
    =1/10. 2
    =1/5

  2. (4/5xx3/8 +4/5xx5/8-4/5xx7/8 ):1/2
    =[4/5xx(3/8+5/8-7/8)]:1/2
    =[4/5xx1/8]:1/2
    =1/10:1/2
    =1/10.2
    =1/5

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