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

Toán Lớp 5: Bài 8 : Tính bằng cách thuận tiện : 14,24 + 8,4 + 5,76 + 11,6 69,63 – 21,67 – 18,33

Toán Lớp 5: Bài 8 : Tính bằng cách thuận tiện : 14,24 + 8,4 + 5,76 + 11,6 69,63 – 21,67 – 18,33

Comments ( 2 )

  1. 14,24 + 8,4 + 5,76 + 11,6
    = ( 14,24 + 5,76 ) + ( 8,4 + 11,6 )
    = 20 + 20
    = 40
    $\text{ ________________________________ }$
    69,63 – 21,67 – 18,33
    = 69,63 – ( 21,67 + 18,33 )
    = 69,63 – 40
    = 29,63

  2. 14,24+8,4+5,76+11,6
    =(14,24+5,76)+(8,4+11,6)
    =20+20
    =40
    ———
    69,63-21,67-18,33
    =69,63-(21,67+18,33)
    =69,63-40
    =29,63

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