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

Toán Lớp 6: m) –20 – (25 – 11 + 8) + (25 – 8 + 20) i) (4 – 9 – 5) – (–4 – 9 + 5) – 15 + 9

Toán Lớp 6: m) –20 – (25 – 11 + 8) + (25 – 8 + 20)
i) (4 – 9 – 5) – (–4 – 9 + 5) – 15 + 9
n) (–20 + 10 – 3) – (–20 + 10) + 27

Comments ( 2 )

  1. m, $\text{- 20 – ( 25 – 11 + 8 ) + ( 25 – 8 + 20 )}$
    = $\text{- 20 – 25 + 11 – 8 + 25 – 8 + 20 }$
    = $\text{ 11 – 16}$
    = $\text{ -5 }$
    i, $\text{( 4 – 9 – 5 ) – ( – 4 – 9 + 5 ) – 15 + 9}$
    = $\text{4 – 9  – 5 + 4 + 9 – 5 – 15 + 9}$
    = $\text{ 8 – 10 + 9 – 15 }$
    = $\text{ – 8 }$
    n, $\text{( – 20 + 10 – 3 ) – ( – 20 + 10 ) + 27}$
    = $\text{- 20 + 10 – 3 + 20 – 10 + 27 }$
    = $\text{- 3 + 27 }$
    = $\text{ 24 }$

  2. Em tham khảo!
    $\text{m) -20-(25-11+8)+(25-8+20)}$
    $\text{=-20-25+11-8+25-8+20}$
    $\text{=-5}$
    $\text{i) (4-9-5)-(-4-9+5)-15+9}$
    $\text{=4-9-5+4+9-5-15+9}$
    $\text{=-8}$
    $\text{n) (-20+10-3)-(-20+10)+27}$
    $\text{=-20+10-3+20-10+27}$
    $\text{=24}$
    ***Khi bỏ ngoặc thì phải đổi dấu, – thành + và + thành –

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

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