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

Toán Lớp 6: a) 19.63 + 36.19 + 19 b) 7 2 – 36 : 3 2

Toán Lớp 6: a) 19.63 + 36.19 + 19 b) 7 2 – 36 : 3 2

Comments ( 2 )

  1. a, 19 · 63 + 36 · 19 + 19
      = 19 · 63 + 36 · 19 + 19 · 1
      = 19 · (63 + 36 + 1)
      = 19 · 100
      = 1900
    b, 72 – 36 : 32
      = 72 – 36/32
      = 72 – 9/8
      = 72 – 1,125
      = 70,875
     

  2. $\text{a) 19 . 63 + 36 . 19 + 19}$
    $\text{= 19 . (63 + 36) + 19}$
    $\text{= 19 . 99 + 19}$
    $\text{= 1881 + 19 }$
    $\text{= 1900}$
    $\text{b) 72 – 36 : 32}$
    $\text{= 72 – $\dfrac{9}{8}$}$
    $\text{= $\dfrac{567}{8}$ }$

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