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

Toán Lớp 6: Tính hợp lý: a) [453+64+(-879)]-(-517) b) -323+[(-874)+564-241] c) -632+(-68)-(-591)+391

Toán Lớp 6: Tính hợp lý:
a) [453+64+(-879)]-(-517)
b) -323+[(-874)+564-241]
c) -632+(-68)-(-591)+391

Comments ( 1 )

  1. Giải đáp:
     $a) [453+64+(-879)]-(-517)$
    $= 453+64+(-879)+517$
    $= (453+517)+(64-879)$
    $= 970-815$
    $= 155$
    $b) (-323)+[(-874)+564-241]$
    $= (-323)+(-874)+564-241$
    $= [(-323)-241]+(564-874)$
    $= (-564)-310$
    $= -874$
    $c) (-632)+(-68)-(-591)+391$
    $= (-632)-68+591+391$
    $= [(-632)-68+591]+391$
    $= (-109)+391$
    $= 282$
     

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

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