Bonjour !
A= 1/8+1/5 = 7/56+40/56 = 47/56
B = 7/25 : 2/15 =7/25×15/2 => 108/50=54/25
C = 3 : 9/10 = 3×10/9 = 30/9 = 10/3
D = 1/5-1/5:7 = 1/5-1/5×1/7 =>
1/5-1/35 = 7/35-1/35 = 6/35
Bon courage.
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Bonjour !
A= 1/8+1/5 = 7/56+40/56 = 47/56
B = 7/25 : 2/15 =7/25×15/2 => 108/50=54/25
C = 3 : 9/10 = 3×10/9 = 30/9 = 10/3
D = 1/5-1/5:7 = 1/5-1/5×1/7 =>
1/5-1/35 = 7/35-1/35 = 6/35
Bon courage.