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\(\left(\frac{19}{13}+\frac{7}{13}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)+\frac{14}{16}\)
= \(\frac{16}{13}+\frac{18}{9}+\frac{14}{16}\)
= \(\frac{42}{13}+\frac{14}{16}\)
= \(\frac{427}{104}\)
=(19/13 + 7/13 ) + (14/6 +4/6 ) +(1/9 +17/9 )
=26/13 +18/6 +18/9
=2 +3 + 2
=7
a)=(3/8+10/16)+(7/12+10/24)
=1+1=2
c)=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)
=3+2+2=7
1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+9+8+9+10+12+13+14+15+16+17+18+19+20+30+1000000=10000274
14/6 + 1/9 + 19/13 + 17/9 + 7/13 + 4/6 = (14/6 + 4/6) + (1/9 + 17/9) + (19/13 + 7/13)
= 18/6 + 18/9 + 26/13
= 3 + 2 + 2
= 7
a,
\(\frac{14}{6}+\frac{1}{9}+\frac{19}{13}+\frac{17}{9}+\frac{7}{13}+\frac{4}{6}\)
\(=\left(\frac{14}{6}+\frac{4}{6}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)+\left(\frac{19}{13}+\frac{7}{13}\right)\)
\(=\frac{18}{6}+\frac{18}{9}+\frac{26}{13}\)
\(=3+2+2\)
\(=7\)
b,
\(\frac{995}{997}x\frac{990}{993}x\frac{997}{990}x\frac{993}{995}x\frac{97}{95}\)
\(=\frac{995x990x997x993x97}{997x993x990x995x95}\)
\(=\frac{97}{95}\)
(Cùng triệt tiêu 995 ; 990 ; 997 ; 993 )