Question

va roggg dau 30 puncte +coroana am nevoie in 20 minute . 1 efectuați operațiile , scriind rezultatul sub forma unei f ractii ireductibile .

/ = supra
1 ) 5 /12 +5 / 24 .
2 ) 26 /21 + 13/14
3 ) 4 / 15+3 / 20
4 ) 5 / 24 + 1 / 12 + 3 / 8
5 ) 7 / 30 - 3 / 20
6 ) 8 / 15 - 9 / 20
7 ) 8 /21 - 4 / 35
8 ) 7 / 6 - 3 / 4 - 1 / 12

Answer 1

5/12+5/24 => 10/24 +5/24 => 15/24
26/21+13/14 => 104/84+ 78/84 = 188/84=> 47/21
4/15+3/20=> 16/ 60+ 9/60= 25/69
5/24+1/12+3/8=> 5/24+2/24+ 9/24 = 16/24=>4/6 => 2/3
7/30-3/20=> 14/60- 9/60= 5/60=> 1/12
8/15-9/20=> 32/60-27/60= 5/60=> 1/12
8/21-4/35=> 40/105- 12/105=> 28/105

La ultimul subpunct nu imi da rezultatul bun , dar celelalte sunt corecte. Sper ca te-am ajutat!