A) 21/11 * 22/17 * 68/63
B)5/14 * 7/13 * 26/25
a] 21/11 * 22/17 * 68/63
b] 5/14 * 7/13 * 26/25
a, = 21.22.68 / 11.17.63
= 21. 22 .68 / 11.22.21.3
=68 / 33
b, =5.7.26 / 14.13.25
= 5 . 7 .13 .2/ 7 . 2.13. 5.5
= 1/5
1
a . 21 |11 * 22 |17 * 68 |63 .
b . 5 | 14 * 7 | 13 * 26 | 25 .
a) \(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}\)
\(=\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)
\(=\frac{3\cdot7\cdot2\cdot11\cdot4\cdot17}{11\cdot17\cdot7\cdot3\cdot3}\)
\(=\frac{2\cdot4}{3}\)
\(=\frac{8}{3}\)
b) \(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}\)
\(=\frac{5\cdot7\cdot26}{14\cdot13\cdot25}\)
\(=\frac{5\cdot7\cdot2\cdot13}{2\cdot7\cdot13\cdot5\cdot5}\)
\(=\frac{1}{5}\)
=))
21/11 × 22/17× 68/63
5/14 × 7/13 × 26/25
Tinh thuab tien nhe
\(\frac{42}{17}\times\frac{68}{63}=\frac{8}{3}\)
\(\frac{5}{26}\times\frac{26}{25}=\frac{1}{5}\)
Tính bằng cách thuận tiện nhất
a) 21/11*22/17*68/63
b) 5/14*7/13*26/25
Tính bằng cách thuận tiện nhất
a) 21/11 × 22/17 × 68/63
b) 5/14 × 7/13 × 26/25
tính bằng cách thuận tiện nhất
a,21/11*22/17*68/63
b,5/14* 7/13*26/25
Tính bằng cách thuận tiện nhất
a) 21/11*22/17*68/63
b) 5/14*7/13*26/25
Tính bằng cách thuận tiện nhất:
a) 21/11*22/17*68/63
b) 5/14*7/13*26/25
21/11 x 22/17 x 68/63
5/14 x 7/13 x 26/25
\(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}=\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)=\(\frac{1\cdot2\cdot4}{1\cdot1\cdot3}=\frac{8}{3}\)
\(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}=\frac{5\cdot7\cdot26}{14\cdot43\cdot25}\)=\(\frac{1\cdot1\cdot2}{2\cdot1\cdot5}\)\(=\frac{2}{10}=\frac{1}{5}\)