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

Toán Lớp 4: tính nhanh; 564 x 89 + 564 + 10 + 564

Toán Lớp 4: tính nhanh;
564 x 89 + 564 + 10 + 564

Comments ( 2 )

  1.  Đề 1 :
    564 xx 89 + 564 + 10 + 564
    =  564 xx 89 + 564 xx 2 + 10
    = 564 xx ( 89 + 2 ) + 10
    = 564 xx 91 + 10
    = 51324 + 10
    = 51334
     Đề 2 : 
        564 xx 89 + 564 xx 10 + 564
    = 564 xx ( 89 + 10 + 1 )
    = 564 xx ( 99 + 1 )
    = 564 xx 100
    = 56400

  2. 564 × 89 + 564 + 10 + 564
    = 564 × 89 + 564 × 1 + 10 + 564 × 1
    = 564 × ( 89 + 1 + 1 ) + 10
    = 564 × 91 + 10
    = 51324 + 10
    = 51334
     

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

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