Question

[han tuyet ky hong nhung]

bai 1 : thuc hien phep tinh:

a)  \(\frac{-5}{2}\)\(:\left(\frac{3}{4}-\frac{1}{2}\right)\)                    b)  \(11\frac{3}{13}-\left(2\frac{4}{7}+5\frac{3}{13}\right)\)                  c)   \(\left(\frac{-5}{24}+0,75+\frac{7}{12}\right):\left(-2\frac{1}{4}\right)^2\)

AI LAM NHANH VA DUNG THI MK SE TICK CHO NGUOI DO  HIHI ^_^

Answer 1

[linh ngoc]

a)\(=\frac{-5}{2}:\left(\frac{3}{4}-\frac{2}{4}\right)\)

\(=\frac{-5}{2}:1=\frac{-5}{2}\)

b)\(=\frac{146}{13}-\left(\frac{18}{7}+\frac{68}{13}\right)\)

\(=\frac{146}{13}-\frac{18}{7}-\frac{68}{13}\)

\(=\frac{146}{13}-\frac{68}{13}-\frac{18}{7}\)

\(=\frac{78}{13}-\frac{18}{7}=6-\frac{18}{7}=\frac{42}{7}-\frac{18}{7}=\frac{24}{7}\)

c)\(=\left(\frac{-5}{24}+\frac{18}{24}+\frac{14}{24}\right):\left(\frac{-9}{4}\right)^2\)

\(=\frac{27}{24}:\frac{\left(-9\right)^2}{4^2}\)

\(=\frac{27\times16}{24\times81}=\frac{2}{9}\)