Question

[Nguyễn Thị Hồng Ngọc]

ai giải giúp mk với, ko cần lm câu D đâu, ai nhanh mk tíckT T

Answer 1

[Yen Nhi]

`Answer:`

a. \(-\frac{2}{3}.\frac{5}{17}+-\frac{2}{17}.\frac{12}{17}+\frac{2}{3}\)

\(=-\frac{2}{3}.\frac{5}{17}+-\frac{2}{17}.\frac{12}{17}-\frac{-2}{3}\)

\(=-\frac{2}{3}.\left(\frac{5}{17}-1\right)+-\frac{2}{17}.\frac{12}{17}\)

\(=-\frac{2}{3}.-\frac{12}{17}+-\frac{2}{17}.\frac{12}{17}\)

\(=\frac{2}{3}.\frac{12}{17}+-\frac{2}{17}.\frac{12}{17}\)

\(=\frac{12}{17}.\left(\frac{2}{3}+-\frac{2}{17}\right)\)

\(=\frac{12}{17}.\frac{28}{51}\)

\(=\frac{112}{289}\)

b. \(\frac{3}{4}.\frac{9}{13}+\frac{3}{4}.\frac{7}{13}-\frac{3}{4}.\frac{3}{13}\)

\(=\frac{3}{4}.\left(\frac{9}{13}+\frac{7}{13}-\frac{3}{13}\right)\)

\(=\frac{3}{4}.1\)

\(=\frac{3}{4}\)

c. \(-\frac{7}{12}.\frac{5}{11}+-\frac{7}{12}.\frac{5}{11}-\frac{1}{3}\)

\(=-\frac{7}{12}.\left(\frac{5}{11}+\frac{5}{11}\right)-\frac{1}{3}\)

\(=-\frac{7}{12}.\frac{10}{11}-\frac{1}{3}\)

\(=-\frac{35}{66}-\frac{1}{3}\)

\(=-\frac{19}{22}\)

d. \(-\frac{1}{5}.\frac{4}{7}+-\frac{1}{5}.1\frac{3}{7}+\left(-\frac{2}{5}\right)\)

\(=-\frac{1}{5}.\left(\frac{4}{7}+\frac{3}{7}\right)-\frac{2}{5}\)

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

\(=-\frac{3}{5}\)