Question

tinh nhanh nhu sau; 5/14*7/13*26/25

Answer 1

5/14x7/13x26/25
Bạn để ý rút gọn 14 cho 7 như sau
5/2x1/13x26/25
=5/26x26/25
Rút gọn 26 với 26,ta đc 5/25=1/5

Answer 2

\(\frac{5}{14}\times\frac{7}{13}\times\frac{26}{25}\)\(=\frac{5\times7\times13\times2}{7\times2\times13\times5\times5}\)\(=\frac{1}{5}\)

Answer 3

ta có phép tính:\(\frac{5}{14}\)x\(\frac{7}{13}\)x\(\frac{26}{25}\)=\(\frac{5x7x26}{14x13x25}\)=\(\frac{910}{4550}\)=\(\frac{91}{455}\)