\(A=\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)
\(A=\frac{-4}{5}+\frac{4}{3}+\frac{-5}{4}+\frac{14}{5}-\frac{7}{3}\)
\(A=\left(\frac{-4}{5}+\frac{14}{5}\right)+\left(\frac{4}{3}-\frac{7}{3}\right)+\frac{-5}{4}\)
\(A=2+\left(-1\right)+\frac{-5}{4}\)
\(A=\frac{-1}{4}\)
A=\(\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)\(\frac{7}{3}\)
=\(\frac{-4}{5}+\frac{4}{3}+\frac{-5}{4}+\frac{14}{5}+\frac{-7}{3}\)=\(\left(\frac{-4}{5}+\frac{14}{5}\right)+\left(\frac{4}{3}+\frac{-7}{3}\right)+\frac{-5}{4}\)
=\(\frac{10}{5}+\frac{-3}{3}+\frac{-5}{4}\)=\(2-1+\frac{-5}{4}\)=\(1+\frac{-5}{4}\)=\(\frac{4}{4}+\frac{-5}{4}\)=\(\frac{4-5}{4}\)=\(\frac{-1}{4}\)
\(A=\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)
\(=\frac{-4}{5}+\frac{4}{3}+\frac{-5}{4}+\frac{14}{5}-\frac{7}{3}\)
\(=\frac{-4}{5}+\frac{14}{5}+\frac{4}{3}-\frac{7}{3}+\frac{14}{5}\)
\(=-2-1+\frac{14}{5}\)
\(=\frac{14}{5}-\frac{15}{5}\)
\(=\frac{-1}{5}\)
\(A=\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)
\(\Rightarrow A=\left(\frac{-4}{5}+\frac{14}{5}\right)+\left(\frac{4}{3}-\frac{7}{3}\right)+\frac{-5}{4}\)
\(\Rightarrow A=2+\left(-1\right)+\frac{-5}{4}\)
\(\Rightarrow A=1+\frac{-5}{4}\)
\(\Rightarrow A=-\frac{1}{4}\)
Các bạn làm câu thứ 2 (câu C) đi, đừng làm câu 1 nữa
\(C=\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{14}+1\frac{5}{7}\)
\(\Rightarrow C=\frac{-5}{7}.\left(\frac{2}{11}+\frac{9}{14}\right)+\frac{12}{7}\)
\(\Rightarrow C=\frac{-5}{7}.\frac{127}{154}+\frac{12}{7}\)
\(\Rightarrow C=-\frac{635}{1078}+\frac{12}{7}\)
\(\Rightarrow C=\frac{1213}{1078}\)
cảm ơn bạn forever alone ở câu c nhưng mà đề cho tính hợp lý mà bạn, mình cũng tính làm như bạn rồi đấy nhưng mà lại nhìn thấy cái đề bắt tính nhanh nên mới hỏi mọi người trên online math đấy
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