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

Toán Lớp 4: Tính bằng cách thuận tiện nhất: a) 79614-37562+37562-9614. b) 4978+1326-5022+674

Toán Lớp 4: Tính bằng cách thuận tiện nhất: a) 79614-37562+37562-9614. b) 4978+1326-5022+674

Comments ( 2 )

  1. a) 79614 – 37562 + 37562 – 9614
    = (79614 – 9614) + (37562 – 37562)
    = 70 000 + 0 = 70 000
    b) 4978 +1326 – 5022 + 674
    = (4978 – 5022) + (1326 + 674)
    = 1956 + 2000 = 3956

  2. $\text{ a) 79 614 – 37 562 + 37 562 – 9614 }$
    $\text{ = ( 79 614 – 9614 ) + ( -37 562 + 37 562 ) }$
    $\text{ = 70 000 + 0 }$
    $\text{ = 70 000 }$
    b) 4978 + 1326 – 5022 + 674 
    $\text{ = ( 4978 – 5022 ) + ( 1326 + 674 ) }$
    $\text{ = -44 + 2000 }$
    $\text{ = 1956 }$
     

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

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