Question

Thực hiện phép tính:

a) \(\frac{7.9-14}{3-17}\)             b) \(0,25.2\frac{1}{3}.30.0,5.\frac{8}{45}\)           c) \(\frac{9}{23}.\frac{5}{8}+\frac{9}{23}.\frac{3}{8}-\frac{9}{23}\)

Answer 1

\(\frac{-7}{2}\)

tích hộ nha

Answer 2

a,\(\frac{7.9-14}{3-17}=\frac{63-14}{-14}=\frac{49}{-14}=\frac{7}{-2}\)

b,\(\frac{14}{9}\)         c,\(0\)

k mình nha đồng thời kb hihi

Answer 3

\(c,\frac{9}{23}\cdot\frac{5}{8}+\frac{9}{23}\cdot\frac{3}{8}-\frac{9}{23}\)

\(=>\frac{9}{23}\cdot\left(\frac{5}{8}+\frac{3}{8}-1\right)\)

\(=>\frac{9}{23}\cdot0=0\)

Answer 4

\(a,\frac{7.9-14}{3-17}\)

\(=\frac{49-14}{-14}=\frac{35}{-14}\)

\(b,0,25.2\frac{1}{3}.30.0,5.\frac{8}{45}\)

\(=\frac{1}{4}.\frac{7}{3}.15.\frac{8}{45}=\frac{1.7.8.15}{4.3.1.45}=\frac{2.7}{3.2.3}=\frac{14}{18}=\frac{7}{9}\)

\(c,\frac{9}{23}.\frac{5}{8}+\frac{9}{23}.\frac{3}{8}-\frac{9}{23}\)

\(=\frac{9}{23}\left(\frac{5}{8}+\frac{3}{8}\right)-\frac{9}{23}=\frac{9}{23}-\frac{9}{23}=0\)