Question

[Ngô Hải Hà]

Tính ( tính hợp lí nếu có thể)

a) ( \(5\frac{2}{7}\). \(\frac{8}{11}\)+ \(\frac{2}{11}\). 5\(\frac{2}{7}\)) : \(3\frac{4}{11}\)- \(1\frac{3}{7}\)

b) [ 0,8 : ( \(\frac{4}{5}\).1,25) ] : ( 0,64 - \(\frac{1}{25}\))

c) ( 6,97 + \(\frac{-7}{12}\)) - ( \(\frac{11}{24}\)+ 5,57)

giúp mik nhanh nha, 10h mik đi hc rùi

Answer 1

[Nguyễn Lê Phước Thịnh]

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: \(=6.97+\dfrac{-7}{12}-\dfrac{11}{24}-5.57\)

\(=1.4-\dfrac{25}{24}=\dfrac{43}{120}\)