a) 21/11 x 22/17 x 68/63 = 21 x 22 x 68/11 x 17 x 63 = 1 x 2 x4/1 x 1 x 3= 8/3
b) kết quả là 2/10 = 1/5
phần b làm như phần a
a) = \(\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)=\(\frac{1\cdot2\cdot4}{2\cdot1\cdot3}\)=\(\frac{4}{3}\)
b) = \(\frac{5\cdot7\cdot26}{14\cdot13\cdot25}\)=\(\frac{1\cdot1\cdot2}{2\cdot1\cdot5}\)=\(\frac{1}{5}\)
\(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}\)
\(=\frac{21}{1}\times\frac{2}{1}\times\frac{4}{63}\)
\(=42\times\frac{4}{63}\)
\(=\frac{168}{63}\)
a) \(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}\)
\(=\frac{21.2.11.4.17}{11.17.3.21}=\frac{2.4}{3}=\frac{8}{3}.\)
b)\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}\)
\(=\frac{5.7.2.13}{2.7.13.5.5}=\frac{1}{5}.\)
\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{1.2.4}{1.1.3}=\frac{8}{3}\)
\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{1.1}{1.5}=\frac{1}{5}\)
" ." là nhân nhé
\(a,\frac{21}{11}.\frac{22}{17}.\frac{68}{63}\)
\(=\frac{1.2.4}{1.1.3}=\frac{8}{3}\)
hok tốt
\(b,\frac{5}{14}.\frac{7}{13}.\frac{26}{25}\)
\(=\frac{1.1}{1.5}=\frac{1}{5}\)
Hok tốt
\(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}\)
\(=\frac{21\times22\times68}{11\times17\times63}\)
\(=\frac{21\times11\times2\times4\times17}{11\times17\times21\times3}\)
\(=\frac{2\times4}{3}=\frac{8}{3}\)
~ Hok tốt ~
\(\frac{5}{14}\times\frac{7}{13}\times\frac{26}{25}\)
\(=\frac{5\times7\times26}{14\times13\times25}\)
\(=\frac{5\times7\times13\times2}{7\times2\times13\times5\times5}\)
\(=\frac{2}{2\times5}=\frac{2}{10}=\frac{1}{5}\)
~ Hok tốt ~
