Tính: \(\,\frac{{19}}{{12}} - \frac{7}{{22}}:\frac{{21}}{{11}}\)

Câu hỏi :

Tính: \(\,\frac{{19}}{{12}} - \frac{7}{{22}}:\frac{{21}}{{11}}\)      

A. \(\frac{{17}}{{12}}\) 

B. \(\frac{{-17}}{{12}}\)  

C. \(\frac{{17}}{{15}}\) 

D. \(\frac{{7}}{{12}}\) 

* Đáp án

A

* Hướng dẫn giải

\(\begin{array}{l}\,\frac{{19}}{{12}} - \frac{7}{{22}}:\frac{{21}}{{11}}\\ = \frac{{19}}{{12}} - \frac{7}{{22}}.\frac{{11}}{{21}}\\ = \frac{{19}}{{12}} - \frac{1}{6}\\ = \frac{{19}}{{12}} - \frac{2}{{12}}\\ = \frac{{17}}{{12}}\end{array}\)

Chọn A

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