Câu hỏi của Nguyễn Như Khanh

Question

Tính nhanh : -5/11.7/11-5/11.8/11+-6/11

Khánh My · Accepted Answer

$\frac{-5}{11}\times\frac{7}{11}-\frac{5}{11}\times\frac{8}{11}+\frac{-6}{11}$

$=\left(\frac{-5}{11}+\frac{5}{11}\right)\times\left(\frac{8}{11}-\frac{7}{11}\right)\times\frac{-6}{11}$

$=0\times\frac{1}{11}\times\frac{-6}{7}$

$=0.$

Câu trả lời:

$\frac{-5}{11}\times\frac{7}{11}-\frac{5}{11}\times\frac{8}{11}+\frac{-6}{11}$

$=\left(\frac{-5}{11}+\frac{5}{11}\right)\times\left(\frac{8}{11}-\frac{7}{11}\right)\times\frac{-6}{11}$

$=0\times\frac{1}{11}\times\frac{-6}{7}$

$=0.$