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

Toán Lớp 5: Tính baăng cách thuận tiện A/4/3×7/11+4/3×4/11 b/5/12+3/13+7/12+10/13

Toán Lớp 5: Tính baăng cách thuận tiện
A/4/3×7/11+4/3×4/11 b/5/12+3/13+7/12+10/13

Comments ( 2 )

  1. Answer
    a, 4/3 xx 7/11 + 4/3 xx 4/11
    = 4/3 xx (7/11 + 4/11)
    = 4/3 xx 11/11
    = 4/3 xx 1
    = 4/3
    _____________________
    b, 5/12 + 3/13 + 7/12 + 10/13
    = (5/12 + 7/12) + (3/13 + 10/13)
    = 12/12 + 13/13
    = 1 + 1
    = 2
     

  2. A, 4/3 \times 7/11 + 4/3 \times 4/11
    = 4/3 \times ( 7/11 + 4/11 )
    = 4/3 \times 1
    = 4/3
    B, 5/12 + 3/13 + 7/12 + 10/13
    = ( 5/12 + 7/12 ) + (3/13 + 10/13)
    = 1 + 1
    = 2
     

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

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