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

Toán Lớp 6: a) 123 + [54 + (-123) + 46] b) -64 + [(-111) + 64 + 71]

Toán Lớp 6: a) 123 + [54 + (-123) + 46]
b) -64 + [(-111) + 64 + 71]

Comments ( 2 )

  1. $\text{ @HV }$
    $\text{ a) 123 + [54 + (-123) + 46] }$
    $\text{ = 123 + 54 – 123 + 46 }$
    $\text{ = (123 – 123) + (54 + 46) }$
    $\text{ = 100 }$
    $\text{ b) -64 + [(-111) + 64 + 71] }$
    $\text{ = -64 – 111 + 64 + 71 }$
    $\text{ = (-64 + 64) – (111 – 71) }$
    $\text{ = -40 }$

  2. Lời giải và giải thích chi tiết:
    a) 123 + [54 + (-123) + 46]
    = 123 + [ 54 + -123 + 46]
    = 123 + 54 + -123 + 46
    = [ 123 + (-123) ] + [ 54 + 46 ]
    = 0 + 100 = 100
    b) -64 + [(-111) + 64 + 71]
    = -64 + [ -111 + 64 + 71 ]
    = -64 + -111 + 64 + 71
    = ( -64 + 64 ) + [ -111 + 71 ]
    = 0 + -40 = -40

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