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a)21/63*22/11*68/17
=1/3*2*4
=8/3
b)5/25*7/14*26/13
=1/5*1/2*2
=1/5
= [20+2]*[50+6]+[50+2]*[20+6]
=20*50+20*6+2*50+2*6+20*50+20*2+6*50+6*2
=6*[50+20]+2*[50+20]+20*[50+50]+2*[6+6]
=6*70+2*70+20*100+24
=420+140+2000+24
=2584
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
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) \(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}\)
\(=\frac{5\cdot7\cdot26}{14\cdot13\cdot25}\)
\(=\frac{5\cdot7\cdot2\cdot13}{2\cdot7\cdot13\cdot5\cdot5}\)
\(=\frac{1}{5}\)
=))