a) 2/5 x 1/2 : 1/3 b 2/9 : 2/3 x 1/2 c 1/2 x 1/3 x 1/4 d 2/7 : 2/3 -1/7

0 bình luận về “a) 2/5 x 1/2 : 1/3 b 2/9 : 2/3 x 1/2 c 1/2 x 1/3 x 1/4 d 2/7 : 2/3 -1/7”

1. Đáp án:

   `a, 3/5`

   `b, 1/6`

   `c, 1/24`

   `d, 2/7`

   Giải thích các bước giải:

   `a, 2/5 × 1/2 : 1/3`

   `= 1/5 ÷ 1/3`

   `= 3/5`

   `b, 2/9 : 2/3 × 1/2`

   `= 1/3 × 1/2`

   `= 1/6`

   `c, 1/2 × 1/3 × 1/4`

   `= 1/6 × 1/4`

   `= 1/24`

   `d, 2/7 : 2/3 -1/7`

   `= 3/7 – 1/7`

   `= 2/7`

   Trả lời

2. Đáp án-Giải thích các bước giải:

   a) `2/5 × 1/2 : 1/3`

   `=1/5:1/3`

   `=1/5×3=3/5`

   b)`2/9 : 2/3 ×1/2`

   `=2/9×3/2×1/2`

   `=1/3×1/2`

   `=1/6`

   c) `1/2 × 1/3 × 1/4`

   `=1/6×1/4`

   `=1/24`

   d) `2/7 : 2/3 -1/7`

   `=2/7×3/2-1/7`

   `=3/7-1/7`

   `=2/7`

   Trả lời