Câu hỏi của Ngô Hải Hà

Question

Tính ( tính hợp lí nếu có thể)

a) ( $5\frac{2}{7}$. $\frac{8}{11}$+ $\frac{2}{11}$. 5$\frac{2}{7}$) : $3\frac{4}{11}$

Nguyễn Lê Phước Thịnh · Accepted Answer

a: $=\left(\dfrac{37}{7}\cdot\dfrac{8}{11}+\dfrac{2}{11}\cdot\dfrac{37}{7}\right):\dfrac{37}{11}-\dfrac{10}{7}$

$=\dfrac{37}{7}\cdot\dfrac{11}{37}\cdot\dfrac{10}{11}-\dfrac{10}{7}$

$=\dfrac{10}{7}-\dfrac{10}{7}=0$

b: $=\left[\dfrac{4}{5}:1\right]:\dfrac{16-1}{25}=\dfrac{4}{5}\cdot\dfrac{25}{15}=\dfrac{4}{5}\cdot\dfrac{5}{3}=\dfrac{4}{3}$

c: $=6.97+\dfrac{-7}{12}-\dfrac{11}{24}-5.57$

$=1.4-\dfrac{25}{24}=\dfrac{43}{120}$

Câu trả lời:

a: $=\left(\dfrac{37}{7}\cdot\dfrac{8}{11}+\dfrac{2}{11}\cdot\dfrac{37}{7}\right):\dfrac{37}{11}-\dfrac{10}{7}$

$=\dfrac{37}{7}\cdot\dfrac{11}{37}\cdot\dfrac{10}{11}-\dfrac{10}{7}$

$=\dfrac{10}{7}-\dfrac{10}{7}=0$

b: $=\left[\dfrac{4}{5}:1\right]:\dfrac{16-1}{25}=\dfrac{4}{5}\cdot\dfrac{25}{15}=\dfrac{4}{5}\cdot\dfrac{5}{3}=\dfrac{4}{3}$

c: $=6.97+\dfrac{-7}{12}-\dfrac{11}{24}-5.57$

$=1.4-\dfrac{25}{24}=\dfrac{43}{120}$