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

Toán Lớp 4: Tính nhanh 525×38+525×61+525+525

Toán Lớp 4: Tính nhanh 525×38+525×61+525+525

Comments ( 2 )

  1.    525 x 38 + 525 x 61 + 525 + 525 
    = 525 x 38 + 525 x 61 + 525 x 1 + 525 
    = 525 x ( 38 + 61 + 1  )  + 525 
    = 525     x      100      +        525
    =         52500       +             525
    =                        53025

  2. 525 xx 38 + 525 xx 61 + 525 + 525
    = 525 xx 38 + 525 xx 61 + 525 xx 1 + 525 xx 1
    = 525 xx ( 38 + 61 + 1 ) + 525
    = 525 xx 100 + 525
    = 52500 + 525
    = 53025
     

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