Répondre :
bonsoir
9/16 + 5/16 = 14/16 = 7/8
15/21 + 5/7 = 15/21 + 15/21 = 30/21 = 10/7
35/56 - 4/7= 35/56 - 32/56 = 3/56
3 + 2/5= 15/5 +2/5 = 17/5
7 - 14/3= 21/3 - 14/3 = 7/3
4/3 x 2/3 = 8/9
2/15 x 7/2 = 14/30 = 7/15
3/4 - 1/4 x 1/3 = 3/4 - 1/12 = 9/12 - 1/12 = 8/12 = 4/6 = 2/3
2/3 x (5/3 - 2/6) = 2/3 x -10/18 = 12/18 - 10/18 = 2/18 = 1/9
9/16 + 5/16 = 14/16 = 7/8
15/21 + 5/7 = 15/21 + 15/21 = 30/21 = 10/7
35/56 - 4/7= 35/56 - 32/56 = 3/56
3 + 2/5= 15/5 +2/5 = 17/5
7 - 14/3= 21/3 - 14/3 = 7/3
4/3 x 2/3 = 8/9
2/15 x 7/2 = 14/30 = 7/15
3/4 - 1/4 x 1/3 = 3/4 - 1/12 = 9/12 - 1/12 = 8/12 = 4/6 = 2/3
2/3 x (5/3 - 2/6) = 2/3 x -10/18 = 12/18 - 10/18 = 2/18 = 1/9
9/16+5/16=(9+5)/16=14/16=7x2/8x2=7/8
35/56-4/7=35/56-4x8/7x8=35/56-32/56=(35-32)/56=3/56
3+2/5=3x5/5+2/5=15/5+2/5=17/5
7-14/3=7x3/3-14/3=21/3-14/3=(21-14)/3=7/3
4/3 x 2/3 = 8/9
2/15 x 7/2 = (2x7)/(15x2)=7/15
3/4-1/4x1/3=1/4x (3-1/3)=1/4 x (9-1)/3=1/4 x 8/3=1/4 x (2x4)/3=2/3
2/3 x (5/3 -2/6) = 2/3 x (10/6-2/6) = 2/3 x 8/6=2/3 x4/3=8/9
35/56-4/7=35/56-4x8/7x8=35/56-32/56=(35-32)/56=3/56
3+2/5=3x5/5+2/5=15/5+2/5=17/5
7-14/3=7x3/3-14/3=21/3-14/3=(21-14)/3=7/3
4/3 x 2/3 = 8/9
2/15 x 7/2 = (2x7)/(15x2)=7/15
3/4-1/4x1/3=1/4x (3-1/3)=1/4 x (9-1)/3=1/4 x 8/3=1/4 x (2x4)/3=2/3
2/3 x (5/3 -2/6) = 2/3 x (10/6-2/6) = 2/3 x 8/6=2/3 x4/3=8/9