Đáp án:
Giải thích các bước giải:
$D=\dfrac{\dfrac{3}8+\dfrac{1}9-\dfrac{3}{41}}{\dfrac{9}8+\dfrac{1}3-\dfrac{9}{41}}+\dfrac{2}{3}$
$⇒D=\dfrac{\dfrac{3}8+\dfrac{1}9-\dfrac{3}{41}}{\dfrac{9}8+\dfrac{3}9-\dfrac{9}{41}}+\dfrac{2}{3}$
$⇒D=\dfrac{\dfrac{3}8+\dfrac{1}9-\dfrac{3}{41}}{3\big(\dfrac{3}8+\dfrac{1}9-\dfrac{3}{41}\big)}+\dfrac{2}{3}$
$⇒D=\dfrac{1}{3}+\dfrac{2}{3}$
`=>D=1`
Lưu ý :
- Từ dòng `1` xuống dòng `2` vì `1/3=3/9` nên `+1/3=+3/9`
