Réponse :
bonjour
Explications étape par étape :
2÷5+7÷10
= 2/5 +7/10
=4/10 + 7/10
=11/10
5÷7-15÷2 =
5/7 - 15/2
=10/14 - 105/14
= -95/14
2÷3×7÷5
=2/3 x 7/5
=14/15
7÷128×258÷3
=7/128 x 258/3
=7/128 x86
=7/64 x 43
=301/64
121÷10×5÷11 =
121/10 x5/11
=11/2
12÷7÷5÷2
12/7 / 5/2
=12/7 x 2/5
=24/35
