Ex3
X=(24×78)÷234
X=1872÷234
X=8
Y=(14/3×1/6)÷7/5
Y=((14×1)/(3×6))÷7/5
=((14÷2)/(18÷2))÷7/5
=7/9÷7/5
=7/9×5/7
=(7×5)/(9×7)
=35/63
=(35÷7)/(63÷7)
=5/9
Z=(2,1×15)÷3,6
Z=31,15÷3,6
Z=8,75
Produit croisé
