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

Toán Lớp 6: Tính hợp lí: – ( -23 + 19 – 11 ) + ( -23 + 13 -11 ) +27

Toán Lớp 6: Tính hợp lí: – ( -23 + 19 – 11 ) + ( -23 + 13 -11 ) +27

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
     -(-23+19-11)+(-23+13-11+27)
    =23-19+11+(-23)+13-11+27
    =[23+(-23)]+ [11+(-11)]-19+13+27
    =0+0-19+13+27
    =(-19)+13+27
    =(-6)+27
    =21

  2. $\text{$-$($-$23 + 19 $-$ 11) + ($-$23 + 13 $-$ 11) + 27}$
    $\text{= 23 $-$ 19 + 11 + (-23) + 13 $-$ 11 + 27}$
    $\text{= [23 + ($-$23)] $-$ 19 + [11 + ($-$11)] + 13 + 27}$
    $\text{= 0 $-$ 19 + 0 + 13 + 27}$
    $\text{= ($-$19) + 40}$
    $\text{= 21}$

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