A) 25/7 : 2 – 1/3 B)4/5 + 10/3 : 2 C) 7/3 – 2/5 x 1/6

A) 25/7 : 2 – 1/3
B)4/5 + 10/3 : 2
C) 7/3 – 2/5 x 1/6

2 bình luận về “A) 25/7 : 2 – 1/3 B)4/5 + 10/3 : 2 C) 7/3 – 2/5 x 1/6”

  1. a) 25/7 : 2 – 1/3
    = 25/7 × 1/2 – 1/3
    = 25/14 – 1/3 MTC: 42
    = 75/42 – 14/42
    = 61/42
    b) 4/5 + 10/3 : 2
    = 4/5 + 10/3 × 1/2
    = 4/5 + 5/3 MTC: 15
    = 12/15 + 25/15
    = 37/15
    c) 7/3 – 2/5 × 1/6
    = 7/3 – 1/15 MTC: 15
    = 35/15 – 1/15
    = 34/15
    $\color{lightblue}{eriet}$

    Trả lời
  2. a) 25/7 : 2 – 1/3
    = 25/7 xx 1/2 – 1/3
    = 25/14 – 1/3
    = 75/42 – 14/42
    = 61/42
    ———–
    b) 4/5 + 10/3 : 2
    = 4/5 + 10/3 xx 1/2
    = 4/5 + 5/3
    = 12/15 + 25/15
    = 37/15
    ———-
    c) 7/3 – 2/5 xx 1/6
    = 7/3 – 1/15
    = 35/15 – 1/15
    = 34/15
    ————–
    => Thực hiện nhân chia trước cộng trừ sau. 
    $\boxed{\color{green}{\text{#????????????????????}}}$

    Trả lời

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